# A Brief Overview of Interior Angles in Geometry

In geometry, an angle is formed when two rays intersect at a common endpoint. The angle is the figure that is formed by these two rays, and it is measured in degrees. An interior angle is simply an angle that lies inside a geometric shape. In this blog post, we'll take a closer look at interior angles, how they are measured, and some of their properties.

## Measuring Interior Angles

There are a few different ways to measure an interior angle. The most common way is to use a protractor. To do this, you'll need to line the base of the protractor up with one side of the angle, and then line the midline of the protractor up with the other side of the angle. The degree mark that lines up with the vertex of the angle will give you the measure of the angle.

Another way to measure an interior angle is to use the Angle Addition Postulate. This states that the measure of an interior angle of a polygon is equal to the sum of the measures of the remote interior angles. So, if you know the measures of some of the other angles in a geometric shape, you can use this postulate to find the measure of an interior angle.

## Properties of Interior Angles

There are a few different properties that apply specifically to interior angles. One such property is that adjacent angles are supplementary. This means that if two angles share a common vertex and side, then the two angles add up to 180 degrees. Another property is that all angles on a straight line add up to 180 degrees. So, if you have multiple angles that all lie on the same line (but don't share a common vertex or side), you can still use this property to find their sum.

## Conclusion

In geometry, an interior angle is simply an angle that lies inside a geometric shape. These angles can be measured in degrees using a protractor or by using the Angle Addition Postulate. Additionally, there are a few properties that apply specifically to interior angles, such as adjacent angles being supplementary and all angles on a straight line adding up to 180 degrees. By understanding these concepts related to interior angles, you'll be well on your way to success in geometry class!

## FAQ

### What are interior angles with example?

An interior angle is simply an angle that lies inside a geometric shape. A few examples of shapes with interior angles are triangles, rectangles, and polygons.

### What are the 3 interior angles?

There are three angles formed when two rays intersect at a common endpoint: the angle formed by the two rays, the angle formed by the vertex of the angle and one of the rays, and the angle formed by the vertex of the angle and the other ray. These angles are typically referred to as the interior angle, the exterior angle, and the remote interior angle, respectively.

### What makes an interior angle?

An interior angle is simply an angle that lies inside a geometric shape. In order to be an interior angle, the angle must share a common vertex and side with the geometric shape.

### What are the properties of interior angles?

There are a few different properties that apply specifically to interior angles. One such property is that adjacent angles are supplementary. This means that if two angles share a common vertex and side, then the two angles add up to 180 degrees. Another property is that all angles on a straight line add up to 180 degrees. So, if you have multiple angles that all lie on the same line (but don't share a common vertex or side), you can still use this property to find their sum.

### What is an interior angle for kids?

An interior angle is simply an angle that lies inside a geometric shape. In order to be an interior angle, the angle must share a common vertex and side with the geometric shape. For example, all the angles in a triangle are interior angles.