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What's a right angle?

A right angle is an angle that measures exactly 90 degrees. It is one of the basic types of angles in geometry and represents a quarter turn or a perpendicular intersection of two lines. Right angles are often denoted by a small square placed in the angle's corner. They are a fundamental aspect of many geometric figur

What's an obtuse angle?

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees. It's larger than a right angle (which is exactly 90 degrees) but smaller than a straight angle (which is exactly 180 degrees). Obtuse angles are common in various geometric shapes and designs.

Answered by: Katie A

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What is the cosine rule?

The Cosine Rule, also known as the Law of Cosines, is a trigonometry rule that relates the lengths of a triangle's sides to the cosine of one of its angles. It's useful for solving triangles that are not right-angled. The rule is expressed as follows: In a triangle with sides of lengths a, b, and c, and with the angl

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