If diagonals of a rhombus are 16 cm and 30 cm. then what is the perimeter (in cm) of the rhombus?

The length of the common chord of two intersecting circles is 24 cm. If the diameter of the circles are 30 cm and 26 cm, then the distance between the center (in cm) is 

If AD, BE and CF are medians of ∆ABC, then which one of the following statements is correct? 

PQRS is square whose side is 20 cm. By joining opposite vertices of PQRS are get four triangles. What is the sum of the perimeters of the four triangles?

Given that (a²+b²)=60, then find the value of (a+b)²+(a–b)².

The length of a chord which is at a distance of 12 cm from the center of a circle of radius 13 cm is 

In the figure below, find the value of AB.

What is the length of the radius of the circumcircle of the equilateral triangle, the length of whose side is 6√3 cm?