right angled triangle
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A triangle can have one obtuse angle and two acute angles. The sum of all three angles must equal 180 degrees.
An isosceles triangle would fit the description providing that the acute angles are equal and that all 3 angles add up to 180 degrees.
An acute triangle leans to the right but an equilateral triangle is wide and straight. An acute angle has three inside angles all of which are smaller than 90 degrees, which adds up to 180 degrees of course, and the sides are not necessarily equal. An equilateral triangle has three sides which are equal and each inside angle = 60 degrees (that is all three of them are the same angle automatically). Sides are equal or angles are equal = equilateral triangle.
An equilateral triangle has 3 equal interior acute angles of 60 degrees
Because the total number of degrees in all triangle is equal to 180. Right triangles consist of one right angle(90) and two equal acute angles(45, 45).