If D,E and F are respectively the midpoint of the sides

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If D,E and F are respectively the midpoint of the sides BC , CA and AB of a Δ ABC and the area of Δ ABC = 36m ². Then area of Δ DEF is ?

1. 12 cm ²
2. 9 cm ²
3. 18 cm²
4. 19 cm²

Correct Option: B

Area of a triangle formed by joining the mid point of the sides of the triangle is 1/4^th of area of the original triangle .
So area of Δ DEF = 36/ 4 = 9 m²