Q. 94.1( 38 Votes )

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


Answer :

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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