The opposite sides of a quadrilateral are parallel. If one angle of the quadrilateral is `60^0,` find the other angles.

A quadrilateral is parallelogram if its opposite angles are equal.

The angles of a quadrilateral are in the ratio 3:5:9: 13. Find all the angles of the quadrilateral.

The angles of a quadrilateral are in the ratio 3:5:9: 13. Find all the angles of the quadrilateral.

The angles of a quadrilateral are in the ratio 3:5: 9:13. Find all the angles of the quadrilateral.

Three angles of a quadrilateral are equal. If the fourth angle is 69^@, find the measure of equal angles.

Which of the following statements are true (T) and which are false (F)? (i) In a parallelogram, the diagonals are equal. (ii) In a parallelogram, the diagonals bisect each other. (iii) In a parallelogram, the diagonals intersect each other at right angles. (iv) In any quadrilateral, if a pair of opposite sides is equal, it is a parallelogram. (v) If all the angles of a quadrilateral are equal, it is a parallelogram. (vi) If three sides of a quadrilateral are equal , it is a parallelogram. (vii) If three angles of a quadrilateral are equal, it is a parallelogram. (viii) If all the sides of a quadrilateral are equal it is a parallelogram

If two sides of a cyclic quadrilateral are parallel , prove that the other two sides are equal

ABCD is a cyclic quadrilateral (see Figure). Find the angles of the cyclic quadrilateral.

All the angles of a quadrilateral are equal. What special name is given to this quadrilateral ?

Opposite angles of a quadrilateral ABCD are equal. If AB = 4 cm, determine CD.