Learn about different types of triangles including scalene, isosceles, equilateral, acute, right, and obtuse on Khan Academy.

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Learn about acute, right, and obtuse angles with Khan Academy's video lesson.

A 30-60-90 triangle is a special right triangle with angles of 30, 60, and 90 degrees. It has properties similar to the 45-45-90 triangle. The side opposite the 30-degree angle is half the …

Given one side length and an acute angle in a right triangle, find another side using trigonometry.

Acute angles measure less than 90 degrees. Right angles measure 90 degrees. Obtuse angles measure more than 90 degrees. Learn about angles types and see examples of each.

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Learn about hypotenuse, opposite, and adjacent sides in right triangles.

The difference between acute, obtuse and right angles. The difference between acute, obtuse and right angles. If you're seeing this message, it means we're having trouble loading external …