19. (41³y 15² - y) dt + (r² + 3y² - 1) dy = 0 20. dt+ye ye' + dy=0 + 2+ y² 17. (tan x sin x sin y) dx + cos x cos y dy = 0

(Compute) What is line OA's direction cosine angle, in degrees, from the y-axis (θy)? Note that direction cosine angles are also known as coordinate direction angles.

Solve for x.       x + 1   0 −1   x    = 2

1- A line 10mm in length inclined at 75 degrees to the x- axis can be represented as, A. will write 0<75 B. will write 0<15 C. will write 10 <15 D. will write 10 <75 2- How will you create a line representing length 15 units at an angle of 30 degrees with respect to the positive direction of the X-axis and the first point of the line is not at the origin? А. 30<15 B. 15<30 С. @30<15 D. @15<30 3- A fillet command is used to produce, A. Sharp corners B. Round corners C. Both of the above D. None of the above 4- Which statement is true about the precedence of lines? A. a hidden line has precedence over a visible line B. a center line has precedence over a visible line C. a visible line has precedence over a center line D. all of the above

Fill in all the missing values. Refer to the following formulas. XL = 2fL L=XL2f f=XL2L

(Compute) What is line OA's direction cosine angle, in degrees, from the z-axis (θz)? Note that direction cosine angles are also known as coordinate direction angles.

LESSON: AUTODESK AUTOCAD Choose from the choices:

(Compute) What is line OA's direction cosine angle, in degrees, from the x-axis (θx)? Note that direction cosine angles are also known as coordinate direction angles.

Problem 2: Values: FA = 20 N FB = 30 N α = 25° Use the graphical method to determine... a) the magnitude of the resultant force on the bolt. Use the law of cosines for this one. b) the angle made by the resultant, as measured relative to the positive x-axis. Use the law of sines for this one. FA α FB

Q1: Draw the projections of the lines and find the true length and V , H ,a , B: 1. AB, A=(1,3), B=(3,3), distance between projections of the points A & B is 5 cm. 2. CD , C=(2.5,6), D=(2.5,2), distance between projections of the points C &D is 4 cm. 3. EF, E=(5.5,3), F=(5.5,3), distance between projections of the points E & Fis 4.5 cm. 4. JK , J=(3,0), K=(6.5,0), distance between projections of the points J & K is 5 cm. 5. NM , N=(0,1.5), M=(0,6), distance between projections of the points N & M is Zero. 6. RT, R=(0,4), T=(0,4), distance between projections of the points R & T is 4 cm.