Answers
Answers
1/2×8×5×sin60=4×5×√3/2=10√3………①
1/2×3×5×sin120=1/2×15×√3/2=15√3/4………②
①＋②=4①/4＋②=40√3/4＋15√3/4
=55√3/4
です。
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