A rectangular paperboard
28in
long and
20in
wide has a semicircle cut out of it, as shown below.

Find the area of the paperboard that remains. Use the value
3.14
for
π
, and do not round your answer. Be sure to include the correct unit in your answer.

Question

A rectangular paperboard 
28in
 long and 
20in
 wide has a semicircle cut out of it, as shown below.

Find the area of the paperboard that remains. Use the value 
3.14
 for 
π
, and do not round your answer. Be sure to include the correct unit in your answer.

anonymous · Answer

I know I need to find the area of the semi circle first to subtract from the over all area and find the remaining piece but how do I go about that again? =o

anonymous · Answer

@satellite73

anonymous · Answer

the area of the entire rectangle = 560
area of semi circle=? 

area of rectangle - area of semi circle = area of paperboard that remains

anonymous · Answer

ok so I found the formula for area of a semi circle.

A= ( Pi * r^2) / 2
A=  (Pi * 10^2) / 2
A = 50Pi

anonymous · Answer

SOOO, 

560 - 50Pi = Ok now this is where I'm stuck because mathway says that's as simplified as it gets, but i'm pretty sure that's not the answer they are looking for and it won't let me type Pi in the answer box =o

anonymous · Answer

Ok so now I replaced Pi with 3.14 and now I have
560 - 157 = 403
area of remaining board = 403

Is that right?

anonymous · Answer

you are correct.

anonymous · Answer

ahh yes! lol thank you =)

anonymous · Answer

yw