An **acute triangle** is a triangle with 3 acute angles.

A **right triangle** is a triangle with 1 right angle.

An **obtuse triangle** is a triangle with 1 obtuse angle.

An **equiangular triangle** is a triangle with three 60° angles.

An equiangular triangle can also be classified as an acute triangle.

- A
**scalene triangle ** is a triangle with no equal side lengths.

An **isosceles triangle** is a triangle with (at least) 2 angles of equal measure and (at least) 2 sides of equal length.

An **equilateral triangle** is a triangle with 3 sides of equal length.

An equilateral triangle can also be classified as an isosceles triangle.

A triangle with an obtuse angle is an obtuse triangle.

A triangle with two angles of the same measure is an isosceles triangle.

So, a triangle with angle measures of 10°, 160°, and 10° is an obtuse isosceles triangle.

A triangle with a 90° angle is a right triangle.

A triangle with no equal side lengths is a scalene triangle.

So, a triangle with a 90° angle and side lengths of 3 inches, 4 inches, and 5 inches is a right scalene triangle.