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I need help understanding this way to find the perimeter

I need help understanding this way to find the perimeter-example-1
User Bobleujr
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1 Answer

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Find the perimeter P

P = sum of all segments external

P= 4 in + 4 in + 3 in + 4 in + 5 in=

Answer is

Perimeter P= 20 inches

User Ascherer
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