A half turn is 180° and is known as a straight angle (or angle on a straight line). A three-quarter turn is 270°. An acute angle is less than 90°. An obtuse angle is between 90° and 180°.

A line which cuts an angle into two equal side angles is called an angle bisector. In geometry a construction is an accurate drawing. There are two main constructions which can be done using a ...

Two congruent angles are simply pairs of angles with equal measures. You can find congruent angles examples in hundreds of everyday objects. For instance, think of any time you've tried to draw a ...