Math question?

15 ⤊

If you have a 27 by 20 foot lawn and wish to put a concrete sidewalk 3 feet wide around the lawn and need to buy 2x4 inch lumber, how many feet of lumber would you need for the perimeter of walk?
I figured it out to be 212 feet. Am I right?

2007-02-06 15:55:56 · 2 answers · asked by blondie 2 in Science & Mathematics ➔ Mathematics

2 answers

p=2l+2w=2*27+2*20=54+40=94'
for the inside perimeter.
for the outside, l & w are each increased by 6' (3' on each side)
p=2(27+6)+2(20+6)=2*33+2*26=66+52=118'
94'+118'=212'

Very good.

2007-02-06 16:01:34 · answer #1 · answered by yupchagee 7 · 15⤊ 0⤋

27 x 20 - ((27-6) x (20 -6))

= 246.

I think it is in rect shape..........

2007-02-06 16:02:03 · answer #2 · answered by colorfulbooks 2 · 0⤊ 0⤋