obtuse triangle
plural of resai
With a swinging motion. / (informal) Very well or with great success; splendidly.
A pannier. / Alternative form of dorsal
(geometry) A triangle one of whose angles is obtuse.
図の鈍角三角形は1つの角が120度で、三角法による通常の解法とは異なる考え方が必要です。
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