Question

the radius of the white circle is 4cm and the radius of the grey circle is an additional 3cm what is the area of the grey region only​

Answer 1

Answer:

103.62 cm squared :)

Step-by-step explanation:

To solve this problem, lets start with the grey area only and essentially we want to treat it like it's own circle. So the formula for circular area is A=pi times r²

so for the radius of the grey region, we will simply add 3 and 4 cm.

3+4=7cm

Then we can plug that into the area equation, which is:

A = (3.14)(7²)

Solve for that and we should get 153.86 cm²

We'll hold onto that for now while we solve for the white circle next:

A = (3.14) (4²)

A = 50.24cm²

Lastly, let's bring back the grey area we found earlier, and subtract the white area from it:

153.86 - 50.24 = 103.62 cm²

hope this helps and good luck~