Question

A dinner plate has a circumference of 100.48 cm. What is the area of the dinner plate? Use 7 = 3.14.

Circumference = 2914 Area Пr2
A. 1,607,68 cm2
B. 200.96 cm?
C. 803.84 cm?
D. 50.24 cm

Answer 1

803.84, or C.

Explanation:

If we know the circumference then we can use that to find the radius!

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(π =pi)

Area of a circle formula: π · r^2

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Let us plug in the circumference into the formula (not the area formula, the circumference one!)

c=2πr

100.48=2πr - 2*3.14 =6.28

100.48=6.28r

divide both sides by 6.28!
r= 16

Now, we plug that in the area formula.

π · r^2

3.14 * 16^2

3.14 * 256 =

803.84