Posted by marie on Thursday, June 2, 2011 at 4:45pm.
Let
H=height in cm.
Base = 2H+6 cm
Area = (1/2)*H*base = 28
H(2H+6)=2*28=56
2H²+6H-56 = 0
H²+3H-28=0
Factorize
(H-4)(H+7)=0
H=4
or H=-7 (negative rejected)
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