alleryBy Heron's formula, what is the area of a triangle with sides 13, 14 and 15 cm?
A42 cm²
B168 cm²
C91 cm²
D84 cm²
Answer & Solution
Correct answer: D. 84 cm²
Semi-perimeter is 21, so area is the square root of 21 x 8 x 7 x 6 = 84 square centimetres.
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