# Using the information in figure 3.12, find the measures of ∠a, ∠b and ∠c.

In the given triangle

a + b + c = 180° …………(1)

c + 100° = 180° ……….(2) [angles in linear pair]

c = 180° - 100°

c = 80°

b = 70° ……………..(3) [opposite angles are equal]

Putting value of b and c in (1)

a + 70° + 80° = 180°

a = 180° - 150°

a = 30°

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