Question

find the value of x​

Answer 1

Answer:

when bc is a straight line

angle abc = 180 - 100 = 80

by angle sum property

angle a + angle b +angle c = 180°

x + 80° + 60° = 180°

x + 140° = 180°

x = 180°-140°

x = 40°

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Answer 2

By exterior angle property, the exterior angle of a triangle is the sum of its opposite interior angles,

Therefore, 100° = x + 60°

x = 100° - 60°

x = 40°

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