Diagonals of a Trapezium ABCD with AB‖CD intersect each other at the point O. If AB=2CD, then the ratio of the areas of ΔAOB and ΔCOD is

If the numerical value of the perimeter of an equilateral triangle is √3 times the area of it, then the length of each side of the triangle is:

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

In a regular polygon, the exterior and interior angles are in the ration 1:4.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:

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

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: 

The radius of the circumcircle of a right-angled triangle is 15 cm and the radius of its in circle is 6 cm. Find the sides of the triangle.