Answer:
a. 18 cm
Explanation:
Area of a circle is given by: A=πr²
where r is the radius and A the area.
therefore we substitute A with the value for the area in the question.
324π=πr²
cancelling the factor π on both sides gives: 324=r²
√324=r
r=18cm
We are given that a circle has an area of 324π cm2. We are required to determine its radius. The formula for the area of a circle with radius r units is;
We plug in the area given and solve for r;
The radius of the circle is 18 cm
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