Elementary Geometry for College Students
6th Edition
ISBN: 9781285195698
Author: Daniel C. Alexander, Geralyn M. Koeberlein
Publisher: Cengage Learning
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Textbook Question
Chapter 7.3, Problem 31E
Given: Regular pentagon RSTVQ with equilateral
Find:
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Qll consider the problem -abu+bou+cu=f., u=0 ondor
I prove atu, ul conts.
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if Blu,v) = (b. 14, U) + ((4,0) prove that
B244) = ((c- — ob)4;4)
③if c±vbo prove that acuius v. elliptic.
Q3: Define the linear functional J: H₁(2)
R by
¡(v) =
a(v, v) - L(v)
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Let u be the unique weak solution to a(u,v) = L(v) in H(2) and suppose that
a(...) is a symmetric bilinear form on H(2) prove that
1- u is minimizer. 2- u is unique. 3- The minimizer J(u) can be rewritten under
1(u) = u Au-ub,
algebraic form
1
2
Where A, b are repictively the stiffence matrix and the load vector
Q4: A) Answer
1- show that the solution to -Au = f in A, u = 0 on a satisfies the
stability Vullfll and show that ||V(u u)||||||2 - ||vu||2
2- Prove that
Where
lu-ul Chuz
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!ull = a(u, u) = Vu. Vu dx + fu. uds
B) Consider the bilinea forta
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a(u, v) = (Au, Av) (Vu, Vv + (Vu, v) + (u,v)
Show that a(u, v) continues and V- elliptic on H(2)
7) In the diagram below of quadrilateral ABCD, E and F are points on AB and CD respectively,
BE=DF, and AE = CF. Which conclusion can be proven?
A
1) ED = FB
2) AB CD
3) ZA = ZC
4) ZAED/CFB
E
B
D
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Chapter 7 Solutions
Elementary Geometry for College Students
Ch. 7.1 - Note: Exercises preceded by an asterisk are of a...Ch. 7.1 - Note: Exercises preceded by an asterisk are of a...Ch. 7.1 - Prob. 3ECh. 7.1 - In Exercises 3 to 8, use the drawing provided....Ch. 7.1 - Prob. 5ECh. 7.1 - Prob. 6ECh. 7.1 - Note: Exercises preceded by an asterisk are of a...Ch. 7.1 - Note: Exercises preceded by an asterisk are of a...Ch. 7.1 - Note: Exercises preceded by an asterisk are of a...Ch. 7.1 - Note: Exercises preceded by an asterisk are of a...
Ch. 7.1 - Note: Exercises preceded by an asterisk are of a...Ch. 7.1 - Prob. 12ECh. 7.1 - Note: Exercises preceded by an asterisk are of a...Ch. 7.1 - Note: Exercises preceded by an asterisk are of a...Ch. 7.1 - Prob. 15ECh. 7.1 - Prob. 16ECh. 7.1 - Prob. 17ECh. 7.1 - Note: Exercises preceded by an asterisk are of a...Ch. 7.1 - Note: Exercises preceded by an asterisk are of a...Ch. 7.1 - Prob. 20ECh. 7.1 - Prob. 21ECh. 7.1 - Prob. 22ECh. 7.1 - Prob. 23ECh. 7.1 - Prob. 24ECh. 7.1 - Prob. 25ECh. 7.1 - Prob. 26ECh. 7.1 - Prob. 27ECh. 7.1 - Prob. 28ECh. 7.1 - Prob. 29ECh. 7.1 - Prob. 30ECh. 7.1 - Prob. 31ECh. 7.1 - Prob. 32ECh. 7.1 - Prob. 33ECh. 7.1 - Prob. 34ECh. 7.1 - Prob. 35ECh. 7.1 - Prob. 36ECh. 7.1 - Prob. 37ECh. 7.1 - Prob. 38ECh. 7.1 - Note: Exercises preceded by an asterisk are of a...Ch. 7.1 - Prob. 40ECh. 7.1 - Prob. 41ECh. 7.1 - Prob. 42ECh. 7.1 - In Exercises 39 and 42, refer to the line segments...Ch. 7.1 - Prob. 44ECh. 7.1 - In Exercises 39 and 42, refer to the line segments...Ch. 7.1 - Prob. 46ECh. 7.2 - Prob. 1ECh. 7.2 - Prob. 2ECh. 7.2 - Prob. 3ECh. 7.2 - What is the general name of the point of...Ch. 7.2 - Prob. 5ECh. 7.2 - Prob. 6ECh. 7.2 - Which lines or line segments or rays must be drawn...Ch. 7.2 - Is it really necessary to construct all three...Ch. 7.2 - Prob. 9ECh. 7.2 - a To locate the orthocenter, is it necessary to...Ch. 7.2 - To locate the centroid of a triangle, is it...Ch. 7.2 - Prob. 12ECh. 7.2 - Prob. 13ECh. 7.2 - Must the centroid of an isosceles triangle lie on...Ch. 7.2 - Draw a triangle and, by construction, find its...Ch. 7.2 - Prob. 16ECh. 7.2 - Prob. 17ECh. 7.2 - Prob. 18ECh. 7.2 - Draw an obtuse triangle and, by construction, find...Ch. 7.2 - Prob. 20ECh. 7.2 - Prob. 21ECh. 7.2 - Is the incenter always located in the interior of...Ch. 7.2 - Prob. 23ECh. 7.2 - Find the length of the radius of the inscribed...Ch. 7.2 - Find the distance from the circumcenter to each...Ch. 7.2 - A triangle has angles measuring 30, 30, and 120....Ch. 7.2 - Given: Isosceles RST RS=RT=17andST=16. Medians RZ,...Ch. 7.2 - Given: Isosceles RST RS=RT=10andST=16. Medians RZ,...Ch. 7.2 - In MNP, medians MB, NA and PC intersect at...Ch. 7.2 - In MNP for Exercise 29, medians MB, NA and PC...Ch. 7.2 - Prob. 31ECh. 7.2 - Prob. 32ECh. 7.2 - Prob. 33ECh. 7.2 - Does a rectangle have a an incenter? b a...Ch. 7.2 - Does a square have a an incenter? b a...Ch. 7.2 - Prob. 36ECh. 7.2 - Does a rhombus have a an incenter? b a...Ch. 7.2 - Does a isosceles trapezoid have a an incenter?.b a...Ch. 7.2 - A distributing company plans an Illinois location...Ch. 7.2 - There are plans to locate a disaster response...Ch. 7.2 - A circle is inscribed in an isosceles triangle...Ch. 7.2 - Prob. 42ECh. 7.2 - Prob. 43ECh. 7.2 - Prob. 44ECh. 7.3 - Describe, if possible, how you would inscribe a...Ch. 7.3 - What condition must be satisfied for it to be...Ch. 7.3 - Prob. 3ECh. 7.3 - What condition must be satisfied for it to be...Ch. 7.3 - Prob. 5ECh. 7.3 - In Exercises 5 to 8, perform constructions....Ch. 7.3 - Prob. 7ECh. 7.3 - Prob. 8ECh. 7.3 - Find the perimeter of a regular octagon if the...Ch. 7.3 - In a regular polygon with each side of length 6.5...Ch. 7.3 - Prob. 11ECh. 7.3 - Prob. 12ECh. 7.3 - Find the lengths of the apothem and the radius of...Ch. 7.3 - Find the lengths of the apothem and the radius of...Ch. 7.3 - Prob. 15ECh. 7.3 - Find the lengths of the side and the radius of a...Ch. 7.3 - Find the measure of a central angle of a regular...Ch. 7.3 - Find the measure of a central angle of a regular...Ch. 7.3 - Find the number of sides of a regular polygon that...Ch. 7.3 - Find the number of sides of a regular polygon that...Ch. 7.3 - Find the measure of each interior angle of a...Ch. 7.3 - Find the measure of each interior angle of a...Ch. 7.3 - Prob. 23ECh. 7.3 - Find the measure of each exterior angle of a...Ch. 7.3 - Find the number of sides for a regular polygon in...Ch. 7.3 - Find the number of sides for a regular polygon in...Ch. 7.3 - Is there a regular polygon for which each central...Ch. 7.3 - Given regular hexagon ABCDEF with each side of...Ch. 7.3 - Given regular octagon RSTUVWXY with each side of...Ch. 7.3 - Given that RSTVQ is a regular pentagon and PQR is...Ch. 7.3 - Given: Regular pentagon RSTVQ with equilateral ...Ch. 7.3 - Given: Regular pentagon JKLMN not shown with...Ch. 7.3 - Is there a regular polygon with 8 diagonals? If...Ch. 7.3 - Prob. 34ECh. 7.3 - Prob. 35ECh. 7.3 - Find the measure of a central angle of a regular...Ch. 7.CR - In Review Exercises 1 to 6, use the figure shown....Ch. 7.CR - Prob. 2CRCh. 7.CR - In Review Exercises 1 to 6, use the figure shown....Ch. 7.CR - Prob. 4CRCh. 7.CR - Prob. 5CRCh. 7.CR - Prob. 6CRCh. 7.CR - Prob. 7CRCh. 7.CR - Prob. 8CRCh. 7.CR - Prob. 9CRCh. 7.CR - Prob. 10CRCh. 7.CR - Prob. 11CRCh. 7.CR - Prob. 12CRCh. 7.CR - Prob. 13CRCh. 7.CR - Prob. 14CRCh. 7.CR - Prob. 15CRCh. 7.CR - Prob. 16CRCh. 7.CR - Prob. 17CRCh. 7.CR - Prob. 18CRCh. 7.CR - Prob. 19CRCh. 7.CR - Prob. 20CRCh. 7.CR - Prob. 21CRCh. 7.CR - Prob. 22CRCh. 7.CR - Prob. 23CRCh. 7.CR - Prob. 24CRCh. 7.CR - Prob. 25CRCh. 7.CR - Prob. 26CRCh. 7.CR - Prob. 27CRCh. 7.CR - In a regular polygon, each central angle measures...Ch. 7.CR - Prob. 29CRCh. 7.CR - Prob. 30CRCh. 7.CR - Can a circle be inscribed in each of the following...Ch. 7.CR - The length of the radius of a circle inscribed in...Ch. 7.CR - Prob. 33CRCh. 7.CR - Prob. 34CRCh. 7.CT - Draw and describe the locus of points in the plane...Ch. 7.CT - Prob. 2CTCh. 7.CT - Prob. 3CTCh. 7.CT - Prob. 4CTCh. 7.CT - Describe the locus of points in space that are at...Ch. 7.CT - Prob. 6CTCh. 7.CT - For a given triangle such as ABC, what word...Ch. 7.CT - Prob. 8CTCh. 7.CT - Which of the following must be concurrent at an...Ch. 7.CT - Classify as true/false: aA circle can be inscribed...Ch. 7.CT - Prob. 11CTCh. 7.CT - Prob. 12CTCh. 7.CT - Prob. 13CTCh. 7.CT - For a regular octagon, the length of the apothem...Ch. 7.CT - For a regular hexagon ABCDEF, the length of side...Ch. 7.CT - For rectangle MNPQ, points A, B, C and D are the...Ch. 7.CT - Prob. 17CT
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- 1) In parallelogram EFGH, diagonals EG and FH intersect at point I such that EI = 2x - 2 and EG = 3x + 11. Which of the following is the length of GH? a) 15 b) 28 c) 32 d) 56arrow_forward5) Which of the following are properties of all squares: 1. Congruent diagonals 2. Perpendicular diagonals 3. Diagonals that bisect vertex angles a) 1 and 2 only b) 1 and 3 only c) 2 and 3 only d) 1, 2, and 3arrow_forward6) In an isosceles trapezoid HIJK it is known that IJ || KH. Which of the following must also be true? a) IJ = KH b) HIJK c) HIJK d) IJ KHarrow_forward
- 1) Given: MNPQ is a parallelogram with MP 1 NQ. Prove: MNPQ is a rhombus. Statement Reason M R Parrow_forward4) Find a proposition with three variables p, q, and r that is never true. 5) Determine whether this proposition is a tautology using propositional equivalence and laws of logic: ((p (bv (bL ← →¬p [1 6) Explain why the negation of "Some students in my class use e-mail” is not "Some students in my class do not use e-mail".arrow_forwardMilgram lemma B) Consider Show that -Au= f in a u=0 on on llu-ulls Chllullz 02 Prove that Where ||ul| = a(u, u) = vu. Vu dx + fonu.u ds Q3: Let V = H' (2), a(u,v) = CR, a(u,v) = (f,v) where Vu. Vv dx + Ja cuv dx and ||u|=|||| Show that a(u, v) is V-ellipiticly and continuity.arrow_forward
- 7) Is the following statement True or False: AU BUA = Ā. Justify your answer. 8) Suppose g: A → B and f: B → C where A = {2,3,6,8}, and g and f are defined by g = {a, b, c, d}, B = {1,2,3}, C = {(a,2), (b,1), (c, 3), (d, 2)} and f = {(1,8),(2,3), (3,2)}. Find fog, gof and f−¹. 9) Verify that a₁ = 7(3") -π is a solution to the recurrence relation an = an 4an-1 -3an-2arrow_forward1) Find the prime factorization of 111111. 2) Find (-88 mod 13) 5 mod 7. 3) Use the Euclidean algorithm to find gcd(144,233).arrow_forward3 10) Suppose B = 2 4 5) and C = (b 2 prove that no such matrix exists. (6 1) . Find a matrix A such that AB = C orarrow_forward
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