Triangle PQR is inscribed in a circle such that P, Q and R lies on the circumference . If PQ is the diameter of the circle and ∠PQR = 40 ° , then what is the value ( in degrees ) of ∠QPR ?

P is a point outside a circle and is 26 cm away from its centre. A secant PAB drawn form P intersects the circle at points A and B such that PB=32 cm and PA=18cm. The radius of the circle (in cm) is:

'G' is centroid of ΔABC if AG = BC then find ∠BGC.

A sector area of 4%   is removed from a circular sheet of paper of diameter 50 cm, If the remaining part is used to make a conical surface , then the ratio of radius and height of the-

If radius of a sphere is decreased by 48%, then by what percent does its surface area decrease?

A wire is in the shape of a rectangle. Its length is 42.7m and breadth is 21.8m. If the same wire is re-bent in the shape of a square, what will be the measure of the side of the square?

If each side of a cube is increased by 10%. Then find the percent change in the volume of the cube.

5√2 cm in a circle. If the long chord makes a right angle at the centre, then what will be the length of the radius of the circle?