Richard, I'm going to assume that if the circumference of the half circle is equal to 10 cm, that means it would be 20 cm if it were a full circle. I'm also assuming that the maximum area of the combined figure is when the rectangle's sides are of equal length. Thus, if 3D + piD/2 = 10 cm, then D = 2.1878 cm. Are you sure this isn't geometry? Sined, Tom Cole Richard Brekne wrote: >Ok guys and gals... so you think you remember you High School Trig eh ?? > >Here is a refresher problem > >A half circle is placed on top of a rectangle such that its diameter is >the top side of the rectangle. The length of the 3 remaining sides of >the rectangle, plus the circumference of the half circle is equal to 10 >cm. > >Question: What are the lengths of the sides of the rectangle when the >area of the combined figure is at its maximum ? > > >... just in case you are bored with your weekend :) > >Cheers >RicB > > >
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