Question 375207
perimeter = 40 
2(L+W)=40
L+W=20
L= 20-W
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Diagonal = 18
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width^2 + length^2 = diagonal ^2
W^2+(20-W)^2=diagonal^2
W^2+400-40W+W^2=D^2
2W^2-40W+400 = 18^2
2W^2-40W+400=324
2W^2-40w+76=0
/2
W^2-20W+38=0
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find the roots x1 & x2 by using quadratic formula
discriminant b^2-4ac=248
x1=((20+sqrt(248))/2
x1= 17.87
x2=((20-sqrt(248))/2
2.13
the other side will be 20-17.87 = 2.13
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