Find the second diagonal of a rhombus when it’s first diagonal length is 12 cm and its side is 10 cm?

If the area of a circle is 9π sq.cm then it circumference is

P and Q are center of two circles with radii 9 cm and 2 cm respectively, where PQ = 17 cm, R is the center of another circle of radius x cm, which touches each of the above two circles externally. If ∠PRQ = 90 °, then the value of x is 

PQR is an equilateral triangle whose side is 10 cm . What is the value (in cm) of the inradius of triangle PQR ?

In the given figure, ∠QRU = 72°, ∠TRS = 15° and ∠PSR = 95°, then what is the value (in degrees) of ∠PQR ?

ΔABC is similar to ΔDEF. Length of AB is 18 cm and  length of the corresponding side  DE is 10 cm. What is the ratio  of Perimeter of ΔABC : Perimeter of ΔDEF?

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

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