
a)
To find:The complete statement of theorem 8.4.
a)

Answer to Problem 20WE
The complete statement of theorem 8.4 is, “If the square of the longest side of a
Explanation of Solution
Giveninformation: Partial statement of theorem 8.4 is given to be completed.
Concept used:If the square of longest side in a triangle is equal to the sum of square of its other two side and angle opposite to longest side is 90 degree, then this triangle is right triangle.
Calculation:Theorem 8.4 is applied in an acute angle that says that the square of the longest side is smaller than the sum of square of its remaining two sides. Accordingly complete the statement of this theorem, starting with given partial statement.
b)
To prove: If
b)

Explanation of Solution
Giveninformation: Atriangle
Concept used:Use the concept of Pythagorean theorem, by drawing a right triangle
Calculation:In drawn right triangle
But in
So, angle opposite to side l is smaller than the angle opposite to side n that is
Conclusion: Thus it proves the statement of that, “If the square of the longest side of a triangle is less than the sum of squares of its other two sides and if angle opposite to longest side is less than 90 degree, then this triangle is an acute triangle.”
Chapter 8 Solutions
McDougal Littell Jurgensen Geometry: Student Edition Geometry
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