Inscribed circle

The circle inscribed in a triangle has a radius 3 cm. Express the area of the triangle using a, b, c.

Result

S = (Correct answer is: 1.5*(a+b+c)) Wrong answer

Solution:

r=3 cm r=2S/(a+b+c) S=1.5⋅ (a+b+c)r = 3 \ cm \ \\ r = 2S / (a+b+c) \ \\ S = 1.5 \cdot \ (a+b+c)

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