Question

The area of a circle with diameter of 11 feet is

The area of a circle with diameter of 10.5 inches is

The area of a circle with radius of 6.3 centimeters is

The area of a circle with radius of 3.25 yards is

Answer 1

1. The area of a circle is calculated using the formula:

$Area = \frac{\pi \: {d}^{2} }{4}$

The diameter is d=11 feet.

This implies that,

$Area = \frac{\pi \times {11}^{2} }{4}$

$Area = \frac{121\pi}{4} = 95.03 {ft}^{2}$

2. For this second question the diameter is d=10.5 feet.

We substitute into the formula to get;

$Area = \frac{\pi \times {10.5}^{2} }{4}$

$Area = \frac{441\pi }{16} = 86.60 {in}^{2}$

3. The area of a circle is given by the formula,

$Area =\pi \: {r}^{2}$

where the radius is r=6.3

This implies that,

$Area =\pi \: {(6.3)}^{2}$

$Area =36.69\pi = 124.69 {cm}^{2}$

4. The given circle has a radius of 3.25 yards.

$Area =\pi \times {3.25}^{2}$

$Area =10.5625 \pi = 33.18 {yd}^{2}$