CIRCUMFERENCE AND AREA OF CIRCLES AND CIRCLE SECTORS
Circles are all around us. Look around the room and find a few circular objects. In our study of circles we will first review the names of the parts of a circle.
Circumference is the distance around a circle. Imagine being a centipede and crawling around the edge of a circle. When the centipede reaches the point on the circle where he started, he has traveled the circumference of the circle. To calculate the circumference of a circle, we use the formula, circumference equals two times “pi” times radius.
We will also examine finding the area of a circle. Area measures the amount of coverage the circle makes. The formula for finding the area of a circle is area equals “pi” times radius squared.
Circle sectors are parts of circles. We find the area of a circle sector by first finding the area of the entire circle, and then find the area of the fractional part of the circle given.
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 Click on the icon to find and practice topics for this unit. |
| Unit 23 Circles Worksheet |
| Click here to watch the video about types of circles. |
| Unit 23 Define Activity |