Each interior angle of a regular polygon is 144⁰. The number of sides of the polygon is 

Each internal angle of regular polygon is two times its external angle. Then the number of sides of the polygon is: 

The length of the common chord of two intersecting circles is 24 cm. If the diameter of the circles are 30 cm and 26 cm, then the distance between the center (in cm) is 

An angle is four times its complementary angle. What is the measure of the angle?

If angle bisector of a triangle bisects the opposite side, then what type of triangle is it?

AD is the median of a triangle ABC and O is the centroid such that AO = 10 cm. The length of OD (in cm) is 

Given that (a²+b²)=60, then find the value of (a+b)²+(a–b)².

If the perimeter of a rhombus is 80 cm and one of its diagonals is 24 cm, then what is the are (in cm²) of the rhombus?