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What is the perimeter? If necessary, round to the nearest tenth.

What is the perimeter? If necessary, round to the nearest tenth.-example-1

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Use the pythagorean theorem and a calculator to find c, sqrt(5.7^2 + 8.1^2)
c=9.9045…
add, 5.7 + 8.1 + c = 23.7 (to the nearest tenth)
User Yue JIN
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