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Two interior opposite angles of a triangle differ by 20° and their exterior angle is 100°. Find the larger interior opposite angle.

Class 7Exterior Angle PropertyTriangles

A54
B120
C66
D60

Step-by-Step Solution

Let angles be a and

b

with

a + b = 100

and

a - b = 20

. Adding:

2 a = 120, a = 60

deg.

Answer: D) 60

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