Question

Find the angles of a parallelogram which is also cyclic

Answer 1

let ABCD a paralleogram
∠A=∠C
again

∠A+∠C=180 (cyclic property)

2∠A=180⇒∠A=90=∠C
similarly ∠B=∠D=90
Thus all the four angles of parallelograms are right angles

Answer 2

∠A+∠C=180 (cyclic property) 
2∠A=180⇒∠A=90=∠C
similarly ∠B=∠D=90
 all the four angles of parallelograms are right angles