SOLUTION: I solved the diameter using C=2pir I got C=2(3.14)(3)=18.84 (I was wrong) How many square feet of concrete surface are there in a circular walkway 8ft wide surrounding a tree if

Question 842353: I solved the diameter using C=2pir I got C=2(3.14)(3)=18.84 (I was wrong)
How many square feet of concrete surface are there in a circular walkway 8ft wide surrounding a tree if the tree has a diameter of 3ft.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
From the center of the tree to the inner edge of the walk is 3 feet.
From the center of the tree to the outer edge of the walk is (3+8) 11 feet.
The area of cement is the area of a circle with radius of 11 feet minus the area of a circle with a radius of 3 ft.
The area of a circle is,

The area of the cement is then,

RELATED QUESTIONS
A rectangular garden is 14 ft. by 21 ft. and is bordered by a concrete walk 3 ft. wide as (answered by checkley77)

I had a test of 46 questions: one question equaled 4 points, a second question had 5... (answered by lynnlo)

how many square feet of concrete surface are there in a circular walkway 8ft wide... (answered by ikleyn)

How many feet does a wheel with a diameter of 18 inches travel after three revolutions?... (answered by josgarithmetic)

I attempted to try this problem for myself, yet I still got the wrong answer. So can you... (answered by rothauserc,MathTherapy)

I solved (7x-2)(4x-3) and the answer I got was 28x^2-8x-15 but my textbook says that's... (answered by Braniac)

There is an aquarium in the shape of a cube that measures 3 feet on each edge. The... (answered by josgarithmetic)

I need help. I tried to solve the following radical expression but think it;s wrong... 2 (answered by Cintchr)

[-3+(-6)]SQAURED - [-8-2(-3)]SQAURED I MULTIPLIED NEG 3 TO NEG 6 GOT 18. THEN SQAURED,... (answered by pwac)