please help me emmyma?!

Question

emmyma · Answer

Yes?

anonymous · Answer

This is the problem... A cement sidewalk will be poured around the outside of a rectangular plot that is 13m by 20m. What will be the area of the sidewalk if it is 1 meter wide?

anonymous · Answer

I originally got 330= the area.

anonymous · Answer

What is wrong with this answer???

emmyma · Answer

two sides of length 13: 13m^2 * 2 = 26 m^2 
two sides of length 20: 20m^2 * 2 = 40 m^2 
four corners of 1m^2 = 4 m^2 
Total is 26 + 40 + 4 = 70 m^2 

Another method is to take the outside area of the cement (22 x 15 since it's 1m bigger on each side, in both width and length) and subtract the "hole" in the middle (20 x 13). 
22*15 - 20*13 = 330 - 260 = 70 m^2

emmyma · Answer

These are all the same concepts.

Just try to figure it out by yourself ! Make sure to give me a medal if I helped. :)) 
I have to go do my own homework now. :) Have a nice night.

anonymous · Answer

Do u sujest anyone else???

emmyma · Answer

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