A rectangular counter 3 feet wide and 5 feet long has a circle cut out of it in order to have a sink installed. The circle has a diameter of 18 inches. What is the approximate area of the remaining countertop surface? Use 3.14 for pi.

A)13.2 ft2
B)29.5 ft2
C)18.9 ft2
D)15.0 ft2

Question

A rectangular counter 3 feet wide and 5 feet long has a circle cut out of it in order to have a sink installed. The circle has a diameter of 18 inches. What is the approximate area of the remaining countertop surface? Use 3.14 for pi.

A)13.2 ft2
B)29.5 ft2
C)18.9 ft2
D)15.0 ft2

anonymous · Answer

so you know you have a rectangle and you want to subtract a circle

You can figure out the area of the rectangle and the area of the circle given the information in the problem if you know the right formulas.

anonymous · Answer

What is the area of the the rectangle and what is the area of the circle?

anonymous · Answer

okay and after I figure out both of their areas, what is the next step?

anonymous · Answer

subtract the area of the circle from the area of the rectangle, but make sure that they both have the same type of units.

anonymous · Answer

Since all of the answer choices are given in terms of ft^2, you should convert everything the ft before you start the problem.

anonymous · Answer

I dont really understand , can you please show me?

anonymous · Answer

What don't you understand?

anonymous · Answer

how to solve it really? okay so I got 15 for the area of the rectangle and for the circle I got 254.34 so now what? Im really confused!

anonymous · Answer

what units did you solve for each area in?  Units are important.

anonymous · Answer

just the formula for area of a circle and rectangle, idk what you mean.

anonymous · Answer

what is the formula for the area of a circle?

anonymous · Answer

Circle Area = πr2

anonymous · Answer

A=πr^2

anonymous · Answer

A=πr^2

anonymous · Answer

thats what i meant squared..oops!

anonymous · Answer

what did you use for r?