Formula for finding the area of a circle:

We need to radius but we only have the diameter.
Luckily for us, if you have the diameter, you have the radius.
Because the radius is the diameter over 2.
10 / 2 = 5
Plug in the values.
A = (3.14)5^2
A = (3.14)25
A = 78.5
So, the answer is 78.5.
Answer:
answer 3:
They are proportion so just put equal sign and see if hey make sense.
Or you can realize that longer side of tringle for the 2 trangles are 10 and 5 and shorter side of triangle are 5 and 2.5 respectively
14 x17 = 238 feet. Area is just length times width
Answer:
I think it is D.
Step-by-step explanation:
Answer: 3400
Step-by-step explanation:
We have, 5% × x = 170
or,
5
100
× x = 170
Multiplying both sides by 100 and dividing both sides by 5,
we have x = 170 ×
100
5
x = 3400
If you are using a calculator, simply enter 170×100÷5, which will give you the answer.