直角三角形の2辺から角度を求める
直角三角形の欠けている角度を見つける
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幾何学におけるSohCahToa三角法を使った辺の長さの計算
例: 2辺の長さが与えられた直角三角形を解く
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Using trig to find two missing sides of a right triangle
角度ともう1辺のみから不足している辺の長さを求める