Discussion

Explanation:

When mid-points of a triangle is formed, we get 4 smaller triangles and area of each of these smaller triangles is one-fourth the area of the larger triangle.

Thus, if area of triangle ABC is 144, the area of triangle formed by joining the midpoints will be 144/4 = 36.

The area of the third triangle will be 36/4 = 9cm2.

Hence, option (d).

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