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

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

In triangle PQR, points A, B and C are taken on PQ, PR and QR respectively such that QC = AC and CR = CB. If ∠QPR = 40°, then ∠ACB is equal to: 

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

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

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 ?

The lengths of one side of a rhombus and one of the two diagonals are 6 cm each. Find the area of the rhombus (in cm²). 

(2x + 4) and (x - 1) are the angle pairs of angles of measurement, then their measurement will be