D and E are the mid-points of AB and AC of triangle ABC. If DE = 5 cm, then BC is:

In triangle ABC, D, E and F are the mid-points of BC, CA and AB. If the perimeter of ABC is 24 cm, find the perimeter of triangle DEF.

In a trapezium ABCD with AB parallel to DC, E and F are the mid-points of the non-parallel sides AD and BC. Prove that EF is parallel to AB and equal to half the sum of AB and DC.

In triangle ABC, D and E are the mid-points of AB and AC. If BC = 12 cm, find DE.

Prove that the quadrilateral formed by joining the mid-points of the sides of any quadrilateral is a parallelogram.

State the mid-point theorem and its converse.

State the mid-point theorem.