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# Unit 8: Circles and composite figures

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## 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.

### Practice

- Radius and diameterGet 5 of 7 questions to level up!

### Learn

### Practice

- Relate diameter and circumferenceGet 3 of 4 questions to level up!
- Circumference of a circleGet 3 of 4 questions to level up!

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

### Practice

- Circumference of parts of circlesGet 3 of 4 questions to level up!
- Area of parts of circlesGet 3 of 4 questions to level up!

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

### Learn

### Practice

- Shaded areasGet 3 of 4 questions to level up!
- Find area of composite figuresGet 3 of 4 questions to level up!

### Practice

- Convert between measurement systemsGet 3 of 4 questions to level up!

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

Up next for you:

Level up on all the skills in this unit and collect up to 1,100 Mastery points!#### Unit test

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