Oh, what a happy little rectangle we have here! To find the area, simply multiply the length by the width. So for a 6cm by 9cm rectangle, the area would be 54 square centimeters. Just imagine all the lovely colors you could paint in that space!
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The area of rectangle is : 18.0
Perimeter = 6cm + 6cm + 9cm + 9cm = 30cm
the area is 54cm squared. which is a little 2 at the top of where m in the cm finishes.
The area of rectangle is : 72.0
if one length is 9cm, the other length must be 6cm to make an area of 54cm. hence the perimeter is 9+9+6+6 = 30cm