Which circles have an area of 9pi m2? choose all answers that are correct. a. a circle with a radius of 3 m b. a circle with a diameter of 6 m c. a circle with a radius of 9 m d. a circle with a diameter of 9 m. multiple choice question!

The formula of the area of a circle is 
A = r²
given the area, find the radius

9 m² = r²
Divide by 

cancels out on both sides

9 = r²
Take square root on either sides
= 
3 m = r
The radius = 3 meters
Be careful for the units given
Its METERS

A. A circle with radius of 3 m
B. A circle with diameter of 6 m
(diameter = 2×radius, 2 × 3 = 6)

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