well the diameter will be 90 and the radius is obviously 180, so you will need to take pie radius squared to find the area, simply press the pie button on your calculator then 180 and then the square button :)
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3850m is the area of the a circle whose radius of 7meaters
The area of a circle, if the radius is 5 cm, is: 78.54 cm2
A circle with a radius of 13 units has an area of 530.93 square units.
A circle with a radius of 11m has an area of ~380.13 m2
Equation for the area circle = pi x radius squared If the area is 144pi, then you need to find the square root of 144, which is 12. Therefore, radius = 12