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Mathematics 7 Online
OpenStudy (anonymous):

If the side of a cube is doubled what happens to its surface area?

jimthompson5910 (jim_thompson5910):

Say you had a cube with each side of 5 units. What is the surface area of this cube?

OpenStudy (anonymous):

150?

jimthompson5910 (jim_thompson5910):

now double each side and then find the new surface area

OpenStudy (anonymous):

600

OpenStudy (anonymous):

so as the sides are doubled the surface area is multiplied by 4?

jimthompson5910 (jim_thompson5910):

150*k = 600 k = ???

OpenStudy (anonymous):

times 4! Thank you!

jimthompson5910 (jim_thompson5910):

yep so if you double the sides, the surface area is multiplied by 4

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