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

Find the area of the largest triangle made in a semicircle of r cm radius?

ABCD is a rhombus whose one angle is 60°.Find the ratio of the lengths of its diagonal?

Triangle PQR is inscribed in the circle whose radius is 14 cm . If PQ is the diameter of the circle and PR =10 cm , then what is the area of the triangle ? 

In a polygon, the sum of the interior angles is double the sum of the exterior angles. What is the number of sides of the polygon?

If one angle is half of its complementary angle, find that angle.

O is the orthocentre of ΔABC. If ∠BOC=110°, ∠BAC is equal to

If the ratio of the measurement of the four angles of a quadrilateral is 1: 2: 3: 4, then the measurement of its smallest angle is-