ABCD is a cyclic quadrilateral (Fig. 3.7 NCERT) . Find the angles of the cyclic quadrilateral.

ABCD is a cyclic quadrilateral (Fig. 3.7 NCERT) . Find the angles of t

1.	ABCD is a cyclic quadrilateral (Fig. 3.7 NCERT) . Find the angles of the cyclic quadrilateral.
Answer» In a cyclic quad we know that sum of opp angle=180So,3y-5+(-7x+5)=180,(eq..1)4y+20+(-4x)=180,(eq..2)Now from eq 1,3y-5-7x+5=180,3y-7x=180,From eq 2,4y-4x=160,X-y=40,Using any method we will get x=-15 and y=25, substitute the value and result will come