Mathematics
Junior High
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至急です!

教えてください!!

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✨ Best Answer ✨

1/2×abc×半径(r)で面積がでる(この場合a-5 b-12 c-13)ので
15r
15r=5×12×1/2
r=2

わたなべ まいか

ありがとうございます!!

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