Answer:
a. 18 cm
Step-by-step explanation:
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;
[tex]A=pi*r*r[/tex]
We plug in the area given and solve for r;
[tex]324pi=pi*r^{2}\\\\r^{2}=324\\\\r=18[/tex]
The radius of the circle is 18 cm
Answer:
a. 18 cm
Step-by-step 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
