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26 April, 00:25

Two of the sides are 8 in.

Lila made a triangular flag to cheer on her favorite sports team. The perimeter of the flag is 20 inches.

Heron's formula: Area = square root s (s-a) (s-b) (s-c)

Approximately how many square inches of fabric were used to make the triangular flag?

15 square inches

76 square inches

186 square inches

215 square inches

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Answers (1)
  1. 26 April, 00:38
    0
    Given that we have a perimeter of 20 inches and 2 sides are 8 inches each, the third side is equal to 4 inches. Solving for s which is the semiperimeter,

    S = 20/2 = 10

    Using Heron’s formula,

    A = sqrt of (10) (10-8) (10-8) (10-4) = 15.49 in2

    Thus, the answer for this item is the first choice.
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