## Introduction

An angle is a geometric figure that is formed when two lines intersect. In a right angle (or 90 degree angle), the two lines meet at a common point, forming a perpendicular angle. When the angle between the two lines is less than 90 degrees, it is considered an **acute angle** and when the angle between the two lines is more than 90 degrees, it is considered an **obtuse angle**.

When the angle between two lines is between 0 and 90 degrees, it is considered an **angle between 0 and 90 degrees** and usually falls into the category of acute angles.

## Types of Angles

Angles can be either acute, obtuse, or right (or 90 degree) angles.

An **acute angle** measures less than 90 degrees. An acute angle is further classified into two types:

- A
**narrow acute angle**measures between 0 and 30 degrees - A
**wide acute angle**measures between 30 and 90 degrees

An **obtuse angle** measures more than 90 degrees and is further classified into two types:

- A
**narrow obtuse angle**measures between 90 and 120 degrees - A
**wide obtuse angle**measures between 120 and 180 degrees

A **right angle**, or 90 degree angle, is made up of two intersecting lines that meet each other at a 90 degree angle. The two lines are also perpendicular to each other, which means they form four right angles.

## How to Calculate an Angle

It is possible to calculate an angle by using simple geometry. Here is a step-by-step guide on how to calculate an angle between 0 and 90 degrees:

Measure the length of the two lines that intersect to form the angle. This can be done with a ruler or measuring tape.

Use the formula for calculating angles and use the two measurements from step 1. This formula is `angle = arc tangent (opposite length / adjacent length)`

.

Substitute the two measurements you took into the formula and calculate the angle.

- The angle that is calculated should fall between 0 and 90 degrees.

## FAQs

### What is an acute angle?

An acute angle is an angle that has a measure of less than 90 degrees. It is further classified into narrow acute angles and wide acute angles, depending on their measure.

### What is an obtuse angle?

An obtuse angle is an angle that has a measure of more than 90 degrees. It is further classified into narrow obtuse angles and wide obtuse angles, depending on their measure.

### What is a right angle?

A right angle (or a 90 degree angle) is an angle that has a measure of 90 degrees. It is made up of two intersecting lines that meet each other at a 90 degree angle and are also perpendicular to each other.

### How can I calculate an angle between 0 and 90 degrees?

You can calculate an angle between 0 and 90 degrees by using the formula `angle = arc tangent (opposite length / adjacent length)`

. To use this formula, it is important to measure the two lines forming the angle with a ruler or measuring tape.

### What is the difference between a narrow acute angle and a wide acute angle?

The difference between a narrow acute angle and a wide acute angle is the range of its measure. A narrow acute angle has a measure between 0 and 30 degrees, while a wide acute angle has a measure between 30 and 90 degrees.