What is a 45 degree angle?

A 45 degree angle is an angle that measures 45 degrees or 1/8 of a circle. It is exactly half of a right angle and forms a straight line when combined with another 45 degree angle. It is a common angle that can be found in geometric shapes such as squares and rectangles, and is also used in construction and engineering for measuring and cutting materials at a precise angle. The trigonometric functions of a 45 degree angle are √2/2 for sine, cosine, and tangent.