Find the area of a triangle if its sides are 4cm, 6cm, 8cm.

univerkov | December 13, 2020 | education

S∆ = √p * (p-a) * (p-b) * (p-c), where p is a semiperimeter, and (a, b, c) are the sides of ∆.
p = (a + b + c) / 2
Decision:
p = (4 + 6 + 8) / 2 = 18/2 = 9 (cm)
S∆ = √9 * (9-4) * (9-6) * (9-8) = √9 * 5 * 3 * 1 = √135 ~ 11.6 (cm2)
Answer: S∆ = 11.6 (cm2)

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