Angles
What Is an Angle?
An angle is the space between two lines that meet at a point. The point where they meet is called the Vertex. Think of opening a book: the space between the covers is an angle.
Types of Angles
- Right Angle – looks like the corner of a square; it measures 90°.
- Acute Angle – smaller than a right angle; it is sharp and pointy.
- Obtuse Angle – bigger than a right angle but smaller than a straight line; it looks wide.
- Straight Angle – a flat line; it measures 180°.
Measuring Angles
We use a tool called a Protractor. It is a half‑circle marked from 0° to 180°.
- Place the protractor’s middle point on the vertex.
- Align one side of the angle with the zero line.
- Read the number where the other side points – that is the angle’s size.
Why Angles Matter
Angles help us build houses, draw pictures, and play games. When you turn a corner while riding a bike, you are changing direction by an angle. Knowing angles makes math and everyday life easier and more fun!