What is the equation of a half circle?

Related questions

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2. What is a radius of a circle?
3. What is the general equation for conic sections?
4. Why does PI go on forever?
5. What is the equation for half a circle?
6. What is the equation of a circle in Y form?
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Tags

1. #upper
2. #general
3. #negative
4. #equations
5. #solved
6. #positive
7. #semicircle
8. #lower
9. #square
10. #result
11. #equation
12. #describes