A circle circumscribes a rectangle with sides 16 cm and 12 cm. What is the area of the circle?

The area of an equilateral triangle is 25√3 cm², then its perimeter is –

Chords AB and CD of a circle intersect externally at P. If CD = 11.6 cm, PD = 6.4 cm and PB = 7.2 cm, then AB (in cm) is equal to:

If the height is doubled and the base is decreased by 20%, then the ratio of old area of the triangle and new area of the triangle is –

The ratio of the side and height of an equilateral triangle is –

A rectangle has an area 30 cm² and perimeter 26 cm. Its sides (in cm) are

The adjacent angles on a straight line are in the ratio 5 ∶ 4, then the smaller angle is –

Two equal circles intersect such that each pass through the center of the other. If the length of the common chord of the circle is 10√3 cm, then what is the diameter of the circle?