**Prove that the four triangles formed by joining in pairs the mid-points of the sides c of a triangle are congruent to each other.**

**Solution:**

**Given:** In ∆ ABC, D, E and r,

F are mid-points of AB, BC and CA respectively. Join DE, EF and FD.

**More Solutions:**

- AC is its diagonal. Show that
- Show that the quadrilateral formed.
- Prove that CF = 14 AC.
- The straight lines ED and EC.
- Prove that the line segment AD.
- AB || DC, E and F are mid-points of AD and BD.
- Prove that PQRS is a rhombus.
- G is mid-point of CD. Calculate:
- In a ∆ABC, AB = 3 cm, BC = 4 cm and CA = 5 cm.
- If P and Q are mid-points of the sides BC and CD.