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An acute angled triangle or acute triangle is a triangle with three acute angles, which are angles measuring less than 90 degrees.

Examples of acute triangles with angles less than 90 degrees.

40^{0}, 51^{0}, 89^{0}

32^{0}, 61^{0}, 87^{0}

60^{0}, 60^{0}, 60^{0}

53^{0}, 76^{0}, 51^{0}

2^{0}, 89^{0}, 89^{0}