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Circles

Question 1 of 3

Know the idea

A circle has a diameter of

12

units. What is the area of the circle, in square units?

Worked example

The radius is half the diameter:

6

. Area

= \pi r^{2} = 36\pi

Video walkthrough

Use the existing worked examples and practice while this walkthrough is being prepared.

A sector of a circle of radius

7

has central angle

60

degrees. Its area is

k\pi

. What is the value of

k