Page 78 - Math Course 3 (Book 2)

Angle Sum and Exterior Angle Theorems

Your Turn! MO. 9 - L2b

Interior Angles
The Exterior Angle Theorem

Vocabulary A-Z

Let us learn some vocabulary

exterior angle
An exterior angle is formed by one side of a
triangle and the extension of another side.

Find the measure of ∠1.
A. 95 exterior
B. 75 angle
C. 67 2
D. 85

Answer 1 3

Find the measure of ∠2.
remote interior angles
A. 95 The interior angles of the triangle not adjacent to
B. 75 a given exterior angle are called remote interior
C. 67 angles of the exterior angle.
D. 85
remote
Answer interior angles 2
Find the measure of ∠3.
1 3
A. 48
B. 75
C. 57 THEOREM 9.3
D. 67

Exterior Angle Theorem
Answer The measure of an exterior angle of a triangle
is equal to the sum of the measures of the two
Right Angles remote interior angles.
The piece of quilt fabric is in the shape of a right
triangle. Find m∠A if m∠C is 62. Y

A. 62
B. 28
C. 38
D. 152 X
Z P

Answer

70