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

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 

The area of a triangle is 456 sq.cm and its height is 24 cm. The length of its base is

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

A field in the shape of a trapezium whose parallel sides are 200 meter and 400-meter-long, whereas each of other two sides is 260 meter long. What is the area (in m²) of the field?

In the triangle ABC, AB = 2 cm, BC = 3 cm and AC = 4 cm. D is the middle point of AC. If a square is constructed on the side BC, what is the area of the square?

In triangle ABC, F is the centroid. If AB=11 cm, BC=14 cm and AC=7 cm, then what is the value (in cm) of EF?