Point D is the midpoint of the outer circle that we aim to find the area of
The circle has a diameter of WZ and radii of WC and CZ
We know that YZ=YD=10 cm
Let DC be

and CY be

The radius of the outer circle can be written as

or

which we can equate to find the value of





Therefore, the radius of the circle is

And hence the area of the circle is

=324
Answer:

hope it helps if it helps don'tforget to like and mark
D. there is no numbers to work with so you just have to use a variable
Step-by-step explanation:
(b) If
then
Note that
cancel out so we get

Solving for
we get

(c) I'm not sure what the problem is asking for but here goes. As r doubles,
becomes

5.38 in expanded form is 5 + 0.3 + 0.08
Expanded form means you have to break it apart into addition.