also: えいかくさんかっけい
noun
acute triangle
A triangle in which all three interior angles are acute (less than 90 degrees). Used in geometry contexts.
鋭角三角形は、すべての角が90度未満です。
An acute triangle has all angles less than 90 degrees.
この問題では、鋭角三角
In this problem, find the area of the acute triangle.