PQR is a right angled triangle in which PQ = QR . If the hypotenuse of the triangle is 20 cm , then what is the area ( in cm ) of the triangle PQR ?

Equation of the straight line parallel to x-axis and also 3 units below x-axis is: 

If the sum of the interior angles of a regular polygon be 1080 °, the number of sides of the polygon is 

If each interior angle is doubled of each exterior angle of a regular polygon with n sides, then the value of n is 

The measure of the angles of a triangle are in the ratio of 2 : 7: 11. Measure of angles are:

In ΔPQR , ∠R=54° the perpendicular bisector of PQ at S meets QR at T. If ∠TPR =46°, then what value of (in degree) ∠PQR?

In triangle ABC a straight line parallel to BC intersects AB and AC at D and E respectively. If AB = 2AD then DE : BC is

The area enclosed between the circumferences of two concentric circles is 45π square cm and their radii are in the ratio of 3:2. What is the area off the outer circle?