There is no rule for the perimeter of an acute triangle. You simply need to add the sides.
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Acute Triangle
an acute triangle
An acute triangle.
No. An acute triangle has to have three acute angles. A right triangle has to have one 90 degree angle.
It impossible for a triangle to have three acute angles. * * * * * What? A triangle most certainly can have three acute angles. Such a triangle would be called an acute-angled triangle!