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3 years ago

HELP ME PLS THANK YOU<<<3333

Mathematics

1 answer:

Vlad [161]3 years ago

4 0

Answer:

≈ 63.30 ft²

Step-by-step explanation:

Heron formula

A = √p(p - a)(p - b)(p - c)

a = 9 ; b = 15 ; c = 20

p = (a + b + c)/2 = (9 + 15 + 20)/2 = 44/2 = 22

A = √22(22-9)(22-15)(22-20)

= √22×13×7×2

= √4004

≈ 63,27

≈ 63.30 ft²

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