Posted by **Danny** on Friday, June 19, 2009 at 6:17am.

A sector of a circle with radius r cm contains an angle of θ radians between the bounding radii. Given that the perimeter of the sector is 7cm, express θ in terms of r and show that the area is r/2(7-2r)cm square. Hence, find the maximum area of this sector as r varies.

I have already done the first part of the question, i only don't know how to do the "hence...". Please help, Thanks!

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