How do you find the equation of a quarter of a circle?

Related questions

1. Can a circle be a function?
2. What is H in an equation?
3. Why is 3.14 called pi?
4. What is the equation of a half circle?
5. What is the calculation for pi?
6. What is H K in math?
7. Who discovered the equation of a circle?
8. How do you find the equation of a circle?
9. What is the general equation for conic sections?
10. What is the equation of a circle in Y form?

Tags

1. #center
2. #tangent
3. #explanation
4. #means
5. #circle
6. #represents
7. #radius
8. #where
9. #touches
10. #formula
11. #point
12. #coordinates
13. #equation