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A different angle (Posted on 2003-10-10) Difficulty: 3 of 5
Look at this shape:

Assume AB = AF = FE = ED and BC = CD, and all the angles in the shape are 90 degrees.

Let A be the area of this shape (in cm^2), and P -- the perimeter of this shape (in cm).

If A - P is 60, what is the length of line AC?

See The Solution Submitted by Lewis    
Rating: 1.9167 (12 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution caca solution | Comment 19 of 23 |

AB=l, Area= (4l^2)-l^2=3l^2

perimeter=8l

equation:3l^2-8l-60=0

l=[8+(784)^0,5]/6

l=[8-(784)^0,5]/6(not real)


  Posted by vije on 2004-07-07 13:42:35
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