If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

# Unit 8: Circles and composite figures

1,100 possible mastery points
Mastered
Proficient
Familiar
Attempted
Not started
Quiz
Unit test

## About this unit

We've built the idea of area by filling rectangles with unit squares. Then we sliced and slid them to form other shapes. But how would we find the area of a circle, which we could keep filling with smaller and smaller rectangles forever without every finishing? We'll find the area and the circumference (like perimeter, but rounded) of circles and other complicated shapes.

## Area of a circle

### Practice

#### Quiz 1

Level up on the above skills and collect up to 320 Mastery points

## Area and circumference challenge problems

### Practice

#### Quiz 2

Level up on the above skills and collect up to 240 Mastery points

## Converting measurements

### Practice

#### Quiz 3

Level up on the above skills and collect up to 320 Mastery points
Up next for you:

#### Unit test

Level up on all the skills in this unit and collect up to 1,100 Mastery points!
Texas 7th grade math is brought to you with support from the Exxon Mobile Foundation