Equation of a circle

CONCEPTS

Circle Equation

• (x – h)² + (y – k)² = r² (Center is (h, k), radius is r, (x, y) is any point on the circle)

PRACTICE PROBLEMS

Question 1 What is the value of x in the point (x, 2) based on (x – 1)² + (y – 2)² = 16?

-- Answer -- (x – 1)² + (y – 2)² = 16

(x – 1)² + (2.2 – 2)² = 1, 1 – 0.2²

ACT PRACTICE PROBLEMS

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