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From a triangle ABC with sides of lengths 40 ft, 25 ft and 35 ft, a triangular portion GBC is cut off where G is the centroid of ABC. The area, in sq ft, of the remaining portion of triangle ABC is
The lengths are given as 40, 25 and 35.
The perimeter = 100
Semi-perimeter, s = 50
Area = $$ \sqrt{50 * 10 * 25 * 15}$$ = $$250\sqrt{3}$$
The triangle formed by the centroid and two vertices is removed.
Since the cenroid divides the median in the ratio 2 : 1
The remaining area will be two-thirds the area of the original triangle.
Remaining area = $$\frac{2}{3} * 250\sqrt{3}$$ = $$\frac{500}{\sqrt{3}}$$
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