A circle and a rectangle have the same perimeter. The sides of the rectangle are 18 cm and 26 cm. The area of the circle is:

If two complimentary angles are in the ratio of 4:5, find the greater angle.

Find the value of ∠OBE=?

ABC is an isosceles triangle with AB = AC, A circle through B touching AC at the middle point of Q, intersects AB at P. Then AP : AB is : 

What is the area (in cm²) of the circumcircle of a triangle whose sides are 6 cm, 8 cm and 10 cm respectively?

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

The exterior angle of a regular polygon is one-third of its interior angle, the number of sides of the polygon is -

The length of a chord which is at a distance of 12 cm from the center of a circle of radius 13 cm is