A triangular pyramid and its net are shown. Rain uses the calculations below to conclude that the surface area of the triangular pyramid is 238.5 square inches. 3(1/2 × 10 × 13) + (1/2 × 10 × 8.7)
3(65) + 43.5
238.5
Is Rain correct?
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the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

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3

step-by-step explanation:

$54.99

step-by-step explanation:

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