A circle touches all four sides of a quadrilateral ABCD whose sides are AB = 8 cm, CD = 9 cm and BC = 7 cm. The length of side AD (in cm) is

In a quadrilateral ABCD, AB = 6 cm, BC = 18 cm, CD = 6 cm and DA = 10 cm. If the diagonal BD = x, then which one of the following is correct?

X, Y and Z are three equilateral triangles. The sum of the areas of X and Y is equal to the area of Z. If the side lengths of X and Y are 6 cm and 8 cm respectively, then what is the side length of Z?

Two parallel sides of a trapezium are 29 cm and 21 cm. Non-parallel sides are equal and each is of length 8.5 cm. What is the area of the trapezium?

A triangle has sides 13 cm, 14 cm and 15 cm long. What is the length of the smallest altitude of the triangle?

The area of a circle is 40π² . The area of a square with sides equal to radius of the circle is