Question

Areas of Circles. Help plz. Will give MEDAL.

Answer 1

Ok what we have to do is find the area of the large circle and then subtract the area of the smaller circle. Do you see how that would give us the area of the shaded region?

Answer 2

Let's see the area of a circle to calculate these. Remember the area of a circle is

Answer 3

Area of the smaller circle: The diamater is 4.5 so the radius is 2.25.
A = (2.25)^2 * pi
= 5.0625pi

Answer 4

I'm guessing you would subtract the big circle minus the smaller one.

Answer 5

I'm sorry I misread the problem. Let me do the areas again

Answer 6

Yup but I did the areas wrong let me fix them

Answer 7

Okay

Answer 8

Area of large circle: diameter = 10.5, radius = 5.25
A = (5.25)^2 * pi
A = 27.5625pi

Answer 9

So we just subtract these and we get: 27.5625pi - 5.0625pi
= 22.5pi
which is approximately equal to 70.7
So the answer is A

Answer 10

Did you understand what I did?

Answer 11

Yep. Thanks for the help.

Answer 12

Happy to help :)