Wednesday, April 19, 2006

volume and surface area questions...

Problem 1
How much cement is needed to build a sidewalk that is one thousand, one hundred twenty metres long, four metres wide and fifty centimetres thick? Round your answer to the nearest cubic metre.

v= length x width x height
= 1120 x .5
= 560 x 4
= 2240 m³

Problem 3
If you have five 5 cm by 5 cm x 5 cm aluminum cubes and superglue them together in a row, what is the surface area of the resulting shape made by the five cubes?

5 x 5 = 25
25 x 5 = 125
25 x 5 = 125

Multiply each by TWO since there are six sides.
25(2) = 50cm²
125(2) = 250cm²
125(2) = 250 cm²

Add your answers and you’ll find the surface area.
50+ 250 +250 = 550cm²

- lynelpobre.




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