This is circle based question from Chapter name- circles

Topic – Angle properties of circles

Chapter number- 15

By using properties of circle we have to Prove that a cyclic parallelogram is a rectangle.

And also that a cyclic rhombus is a square.

ICSE Avichal publication

Understanding ICSE Mathematics

Question no 15

Solution:(a) ABCD is a cyclic parallelogram.

To prove: ABCD is a rectangle

Proof: ABCD is a parallelogram

∠A = ∠C and ∠B = ∠D