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#### Ontario Curriculum Expectation:

#### 6.E2.2 use a protractor to measure and construct angles up to 360°, and state the relationship between angles that are measured clockwise and those that are measured counterclockwise.

**What is an Angle?**

**An angle is formed by two lines called arms. The arms meet at a point, called the vertex.**

**An angle is shown by drawing a curved line (called an arc) between the arms. The size of the angle is always written inside or next to the arc of the angle.**

**Measure the precise size of an angle with the unit called degrees (**º**). Degrees describes the amount an angle turns.**

**Here are different types of angles and their measurements:**

### 1. Acute Angle

When an angle is less than 90º, it is called an **acute angle**.

### 2. Right Angle

A quarter of a circle is 90º. It is called a **right angle**.

### 3. Obtuse Angle

When an angle is more than 90º, it is called an **obtuse angle**.

### 4. Straight Angle

When an angle is exactly 180º, it is called a **straight angle**.

### 5. Reflex Angle

When an angle is between 180º and 360º it is called a **reflex angle**.