An Acute Triangle
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A triangle with 3 acute angles is simply called an acute triangle.An example is an equilateral triangle, which has three angles of 60° (acute).
A triangle can have up to all three acute angles. An equilateral triangle has three- sixty degree angles, which are acute.
If all three angles of a triangle measure less that 90 degrees (if all three angles are acute), the triangle is an acute triangle. A triangle that has a right angle (an angle the measures exactly 90 degrees) is a right triangle. (The other 2 angles will be acute angles.) A triangle that has an angle that is greater than 90 degrees (an obtuse angle), is an obtuse triangle. (The other 2 angles will be acute angles.)
A triangle with an acute angle.An acute triangle has all three angles less than 90 degrees.
In Euclidean geometry a right angle triangle has two acute angles. All others have three.