Question

The angles A,B,C,D of a quadrilateral ABCD in that order are in the ratio 5:7:7:11. The measure of angleC is:

Answer 1

Let the ratio be 'x'.

AS PER QUESTION

5x+7x+7x+11x=360 (angle sum property)

30x=360

x=360/30

x =12

Measure of 3rd angle is 7x=7X12

=84