Oh, dude, it's like super easy. So, to find the surface area of a square, you just multiply the length by the width. In this case, the length is 30 feet and the width is 10 feet, so you just do 30 x 10 and get 300 square feet. Boom! Math is fun, right?
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30ft x 10ft = 300 square feet
100 square units
The area is: 10*10 = 100 square cm
It is: 10cm because 10*10 = 100 square cm
Surface area = 4*p*102 = 400*pi or 1256.637061 square units