Question

The circle below has a radius of 10 cm. What is the area of the shaded region? If necessary, round your answer to two decimal places. Do not include units in your answer.

Answer 1

is the answer 78.54 ? or 78.50?

Answer 2

circle has area pi r^2, this is 1/4 of that

Answer 3

\[a_{\text{circle}}=\pi r^2\]\[\frac{\pi (10)^2}{4}=25\pi\]

Answer 4

Yes, it is 78.50.

Answer 5

so you have \(25\pi \;\text{cm}\)

Answer 6

78.54

Answer 7

octave tells me that it is 78.5398163397448, so if you trust my computer, then I agree with 78.54!

Answer 8

Oh, I'm sorry. I always get the pi equals 3.14...