Ch 17 Circles

Question 1

Area of a circle

Answer 1

A = (pi)(r)^2

Question 2

Circumference of a circle

Answer 2

C = 2(pi)r

Question 3

Arc Length

Answer 3

L = (theta/360)(2(pi)r) OR (theta)r if theta is in radians

Question 4

Area of a sector

Answer 4

A = (theta/360)((pi)(r^2)) OR (1/2)(r^2)(theta)

Question 5

Equation of a circle in the xy-plane

Answer 5

(x — h)^2 + (y — k)^2 = r^2