Question

Can someone check my homework please. I need help with the last question though. Thanks in advance =)

Answer 1

1). Area of a circle with R = 12:
A = R^2*Pi= 144Pi
Area of the shaded sector: 144*Pi*(30/360) = 12Pi
2. Area of circle with R = 16.
A = 256*
Area of the sector: 256Pi*(45/360) =32 Pi
3) Are of circle with R = 8 -.A = 64Pi
Area of sector, quarter of the circle: 64Pi/4 = 16*Pi = 50.24
Minus the area of triangle: 8*8/2 = 32
Are of shaded area: 50.24 - 32 = ......

Answer 2

I don't know if should go with you or robtobey =/

Answer 3

4. Area of circle with R = 18: A = (18)^2*Pi = 243*Pi
Shaded area = (3/4) of circle + are of triangle
3/4 area of full circle: 243*Pi*(3/4) = 243Pi = 763.12
Plus area of triangle: 18x9 = 162
Shaded area: 763.12 + 162 = .....
5). Shaded area = Area of square - area of one circle
Area of the square: 8x8 = 64
Area of a circle: Pi*R^2 = 16*Pi = 50.24
Shaded area: 64 - 50.24 = ....

Answer 4

Okay. So the answer to question 1 would be 12pi square inches. Question 2 would be 32pi square centimeters. Question 3 would be 18.2 square feet. Question 4 would be 925.1 square feet. And Question 5 would be 13.8 square feet?

Answer 5

first ans is 12

Answer 6

\(\bf \large \textit{area of a sector of a circle}=\cfrac{\theta \pi r^2}{360}\qquad
\begin{array}{llll}
\theta=\textit{angle in degrees}\\
r=radius
\end{array}\)
just like you've done the other ones -> http://openstudy.com/study#/updates/5337448ae4b02a0194d82d61

Answer 7

second one is 16

Answer 8

Just as a side note @EG145341 , The easiest way to think about areas of a section of a circle is to think about what faction of the circle they are, then all you have to do is multiply that fraction against the total area of the circle.