A circle has two special parts called a sector and a segment. Even though they are related, they are not the same.

• A sector is like a piece of pizza! It is shaped like a wedge and is made up of two straight lines (called radii) and the curved part (called an arc) between them. If you have a circle with a radius of $r$ and a central angle of $\theta$, you can find the area of that sector using this formula:

$\text{Area of Sector} = \frac{\theta}{360} \times \pi r^2$

• A segment, however, is a bit different. It's the area that is between a straight line (called a chord) and the curved part (the arc). You can think of it as a piece of pizza with the top part missing. To find the area of a segment, you take the area of the sector and subtract the area of the triangle inside. It looks like this:

$\text{Area of Segment} = \text{Area of Sector} - \text{Area of Triangle}$

So, remember this: sectors are made with radii, while segments are made with chords!