Question

A snare drum has diameter fourteen inches. A bass drum has diameter thirty-six inches. What is the difference in the areas of the two drums?

sixty-nine point zero eight square inches
four hundred eighty-four square inches
eight hundred sixty-three point five square inches
three thousand nine hundred fifteen point five eight square inches

I will medal and fan

Answer 1

area = pi r^2 where r = radius
radius = 1/2 the diameter

Answer 2

so wat is the answer?

Answer 3

That is for you to calculate.

Answer 4

Do you know how to find the area of a circle?

Answer 5

nope

Answer 6

AreaBassDrum - AreaSnareDrum = A = pi r^2

= pi*[d(Bass)/2]^2 - pi*[d(snare)/2]^2

Answer 7

You need the formula above and the radius.
The radius is half of the diameter.

Answer 8

If a circle has diameter 14 inches, what is its radius?

Answer 9

do u guys know the answer but u r just telling me step by step?

Answer 10

7 r

Answer 11

I don't know the answer because I have not solved this problem.
I am trying to guide you in the solution of the problem by showing you each step you need to do.

Answer 12

k thx i just had to knw

Answer 13

so is it 7r?

Answer 14

Good. One radius is 7 in.
The other circle has diameter 36 inches. What is its radius?

Answer 15

oh ok good

Answer 16

18 r

Answer 17

Good.
We have two circles with radii 7 inches and 18 inches.
Now we find the two areas.

The formula for the area of a circle is

\(A = \pi r^2\)

Area equals "pi" times the radius squared.
The radius squared is the radius times the radius.
pi is a Greek letter used in math that has a value of approximately 3.14