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Home > MC2 > Chapter 9 > Lesson 9.2.2 > Problem 9-51

9-51.

The area of a rectangle is 42 cm2. If the length and width each grow four times longer, what will the new area be? Homework Help ✎

Make an example of a rectangle with an area of 42 cm2.
Since the area of a rectangle is (base)(height), which two numbers multiplied together gives 42?

Multiply base and height by 4

Now find the area of the larger rectangle by multiplying the new base and the new height.