Mathematics

# Find the value of the unknown exterior angle x in the following diagrams.

##### SOLUTION
Sum of all angles of a $\Delta le = 180^o$
$30^o + 60^o + \angle ABC = 180^o$
$\therefore \angle ABC = 90^o$
Now, $x + \angle ABC = 90^o$
$\therefore x = 90^o$

$Or$
Since, Exterior angle$=$Sum of interior opposite angles, therefore $x=60^o+30^o=90^o$.

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Subjective Medium Published on 09th 09, 2020
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