# What is an angle formed by?

An angle is formed by the intersection of two straight lines. If the lines are perpendicular, they will form right angles.

### What is exterior of an angle?

The interior angle of a polygon is the angle formed by two adjacent sides of a polygon where the angle lies inside the area formed by the polygon. The exterior angle is that formed by one of these sides and the line formed by extending the other side. Consequently, External angle = 180 deg - Internal angle. Because they form supplementary angles, it does not matter which of the two sides you extend.

### How do you know what the vertex of an angle is?

An angle is formed when two lines meet (or cross). The vertex is the point where the lines meet. An angle is formed when two lines meet (or cross). The vertex is the point where the lines meet. An angle is formed when two lines meet (or cross). The vertex is the point where the lines meet. An angle is formed when two lines meet (or cross). The vertex is the point where the lines…