Trigonometry close trigonometryThe study of sides and angles in triangles. can be used to find a missing angle in a right-angled triangle ... takes an input and does something to it to create ...

The right angle drill is pretty versatile and can be useful in nearly any DIY project that gets you into tight spaces, such as plumbing and other construction projects. For example, when drilling ...

However, there is no rule stating that adjacent angles have to fit into those three categories. These examples of adjacent angles will add up to values other than 90, 180 or 360 degrees.