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You can solve this problem using polar coordinates.
See correct answer
極座標を使って、この問題を解くことができます。
Related words
極座標
Hiragana
きょくざひょう
Noun
Japanese Meaning
点の位置を、原点からの距離（動径）と基準となる半直線からの角度で表す座標系。
Easy Japanese Meaning
ある点のばしょを、まんなかからのきょりと、ななめのむきであらわすほうほう
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Japanese - English
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