have four sides and four angles. Interior angles in a quadrilateral ... The techniques used are useful for solving all kinds of other geometry problems too. There are two rules to remember.

Trigonometry explores the relationship between sides and angles in right-angled triangles. The hypotenuse is the longest side and is always opposite the right angle. The opposite side is the side ...

Each side of the Great Pyramid rises at an angle of 51.5 degrees to the top. Not only that, each of the sides are aligned almost exactly with true north, south, east, and west. For a pyramid to ...