If the diagonal of a rhombus are 18 cm and 24 cm respectively, then its side is equal to

Given: The diagonal of a rhombus are 18 cm and 24 cm respectively.

The diagonals of a rhombus bisect each other at right angles (90°).
This means that each diagonal is divided into two equal halves.

Diagonal 1 = 18 cm → Each half = 9 cm

Diagonal 2 = 24 cm → Each half = 12 cm

Each side of the rhombus forms the hypotenuse of a right-angled triangle, So

​$$s^2 = 9^2 + 12^2$$

The side of the rhombus is 15 cm.

Thus, the correct answer is (b).​​