Question

A
EXERCISE 14.1
1
1. If three angles of a quadrilateral are 20°, 90° and 90°, find the fourth angle of the quadrilateral.

Answer 1

1. Sum of all the angles in a quadrilateral

therefore , 20 + 90 + 90 + × = 360

=> 200 + × = 360

=> × 360 - 200

=> × = 160

◦•●◉✿VERIFICATION ✿◉●•◦

To verify it put the value of x

=>20 + 90 + 90 + 160 = 360

=> 360 = 360

hence , LHS = RHS

There fore the answer is 160 degree

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