Mathematics
Senior High
(1)の計算が分からないです。教えてください🙇⋱
33 [3TRIAL 数学Ⅰ 問題257]
次のような △ABCについて, 内接円の半径を求めよ。
(1) a=17,b=15,c=8
(2) a=5,c=3,B=120°
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r=3です。