Question

Find the area of the circle. Use 3.14 for pi. Round to the nearest unit. A circle has a diameters of 18 centimeters. A. 1,017 cm2 B. 254 cm2 C. 57 cm2 D. 28 cm2 2 / 5

Answer 1

Answer:

B. 254 cm²

Step-by-step explanation:

Hello!

Circle

The formula for the area of a circle is $A = \pi r^2$

• A is area
• π is pi (roughly 3.14)
• r is the radius

The radius is half of the diameter, given with the formula $D = 2r$

Area

Using the information, we can first solve for the radius.

• $D = 2r$
• $18 = 2r$
• $9 = r$

The radius is 9

Now we can plug 9 into the area formula:

• $A = \pi r^2$
• $A = \pi (9^2)$
• $A = 81\pi$

We are going to use 3.14 for pi

• $A = 81(3.14)$
• $A = 254.34$

The area is 254.34cm².

We are going to round to the nearest whole centimeter, which is roughly 254cm² or $\boxed{\text{Option B}}}$