Question

in a cyclic quadrilateral ABCD 5angleA=13 angleC find angle A​

Answer 1

Step-by-step explanation:

In cyclic quadrilateral sum of opposite angles is 180

−4x+4y+20=180⟹y−x=40

y=40+x

−7x+5+3y−5=0

7x−3y+180=0

7x−3(40+x)+180=0

4x+60=0

x=−15 ⟹y=25

∠A=4(25)+20=120