SOLUTION: A square cardboard of side 1.2m has a 10 cm wide border round the exterior of three of its sides. Find the area of the border?

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Question 202783: A square cardboard of side 1.2m has a 10 cm wide border round the exterior of three of its sides. Find the area of the border?
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
The area of the square cardboard (1.2X1.2)m. or (120X120)cm. is:
A+=+%281.2%29%5E2sq.m. or %28120%29%5E2+=+14400sq.cm
A+=+14400sq.cm.
The area inside of the border is:
a+=+%28120-20%29%28120-10%29
a+=+%28100%29%28110%29
a+=+11000sq.cm. Subtract the inside area from the entire area.
highlight%2814400-11000+=+3400%29sq.cm. This is the area of the border.