



 
Hi Mark, Suppose the rectangle is x cm by y cm. The perimeter is 2x + 2y = 38 so
The two sides and diagonal form a right triangle with hypotenuse of length 15 cm so Pythagoras tell us
You want the area which is given by
These three quantities make me think of the expression
Does this help? Mark wrote back Ahhhh yeah. Still not gettin it. Plz Help! Step by Step would be great. Thanks Mark, Since x + y = 19 and x^{2} + y^{2} = 15^{2}, (x + y)^{2} = x^{2} + 2xy + y^{2} yields
Solve for the quantity xy which is the area. Penny  


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