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Need help with dimensions question

The rectangle is 7cm by 5cm Each side of the rectangle is enlarged by a scale factor of four. (a) Write down the dimensions of the enlarged rectangle. (b) How many times bigger is the perimeter of the enlarged rectangle than the perimeter of the small rectangle? (c) How many times bigger is the area of the enlarged rectangle than the area of the small rectangle? -------------------------- Thanks :D
Question asked by: chrisowen

Asked on: 15 Feb 2011

7 x 4 is 28 and 5 x 4 is 20 so it becomes 28 x 20 as the new dimensions.

And basically from there the question is straightforward: add two of those together each to get the new perimeter and multiply to get the area.

By: knowitall
Replied at: 06 Mar 2011
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