help | Mathematics | Page 1

flat snow Aug 11, 2023, 8:04 PM

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i need help solving this

subtle magnetBOT Aug 11, 2023, 8:04 PM

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flat snow i need help solving this

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flat snow Aug 11, 2023, 8:05 PM

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@daring halo

daring halo Aug 11, 2023, 8:09 PM

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flat snow i need help solving this

Suppose the triangle has area S, perimeter P and inradius r. Then:
S = Pr/2

flat snow Aug 11, 2023, 8:10 PM

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how s that

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i didnt understand

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how s = pr/2

daring halo Aug 11, 2023, 8:13 PM

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You can see it if you divide a triangle into three by drawing lines from the incenter to each vertex. It's a well-known relation.

flat snow Aug 11, 2023, 8:14 PM

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so what is p/2

daring halo Aug 11, 2023, 8:15 PM

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P/2 is half the perimeter.

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You are given the perimeter and the indiameter, so you can already apply the formula. Just note that ypu have diameter instead of radius.

flat snow Aug 11, 2023, 8:16 PM

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aah i thought its pi

daring halo Aug 11, 2023, 8:16 PM

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No, that would be π.

flat snow Aug 11, 2023, 8:17 PM

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perimeter of the cercle

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???

daring halo Aug 11, 2023, 8:18 PM

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No, perimeter of the triangle.

flat snow Aug 11, 2023, 8:19 PM

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aah okay

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thanks

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hey got any idea

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on this

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#help