Mathematics

Find the value of the unknown interior angle x in the following figure.


SOLUTION
$$80^o + \angle BAC = 180^o$$
$$\therefore \angle BAC = 100^o$$
Sum of interior angles of a $$\Delta le$$ is $$180^o$$
$$\Rightarrow x + 30^o + \angle BAC = 180^o$$
$$\therefore x = 50^o$$
$$OR$$
Since, Exterior angle$$=$$Sum of interior opposite angles, therefore $$30^o+x=80^o$$
$$\Rightarrow x=80^o-30^o=50^o$$.
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Subjective Medium Published on 09th 09, 2020
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