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

If the perimeter of an equilateral triangle is 18 cm, then length of each median is

If ∆ABC is an isosceles triangle with ∠C = 90° and AC = 5 cm then AB is : 

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

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. 

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:

The diagonals AC and BD of a cyclic quadrilateral ABCD intersect each other at the point P. Then, it is always true that