Geometryhard · Past Paper
Calculate the area of a triangle with sides a=7, b=8, c=9.
A12 sqrt(5)
B15 sqrt(3)
C24 sqrt(2)
D10 sqrt(7)
✓ Correct Answer: A — 12 sqrt(5)
s = (7+8+9)/2 = 12. Area = sqrt(12*5*4*3) = sqrt(720) = 12 sqrt(5).
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