SOLUTION: My question is below, I feel kind of dumb asking it, but it has me puzzled. A rectangular swimming pool is surrounded by a concrete border. The swimming pool is 50 meters long an

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Question 41976: My question is below, I feel kind of dumb asking it, but it has me puzzled.
A rectangular swimming pool is surrounded by a concrete border. The swimming pool is 50 meters long and,25 meters wide,and the concrete border is 3 meters all around the pool.
A. Find the perimeter
I did this by adding all 4 sides
50+ 25+50+ 25= 150 meters.
I get lost with the next two questions:
b. Find the perimeter of the rectangle formed by the border around the pool
Will I add all sides by 3
c. Find the area of the concrete border.
do I multiply 3 * 4?
Found 2 solutions by checkley71, psbhowmick:
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
50+6+50+6+25+6+25+6=174 meters for the perimeter of the border.
Because the border is 3 meters wide youn need to add 3 meters to both ends of the length & width.

Answer by psbhowmick(878) About Me  (Show Source):
You can put this solution on YOUR website!


Rectangle ABCD represents the swimming pool.
Rectangle EFGH represents the swimming pool surrounded by the concrete border.
AB = CD = 50 m and BC = DA = 25 m
EF = GH = 50 + 2x3 = 56 m and FG = HF = 25 + 2x3 = 31 m

So, perimeter of outer rectangle i.e. rectangle EFGH = 2(EF + FG) = 2(56 + 31) = 174 m.

Area of the outer rectangle = 56 x 31 = 1736 m%5E2.
Area of the inner rectangle = 50 x 25 = 1250 m%5E2.
So, area of the concrete border = 1736 - 1250 = 486 m%5E2.