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 teh 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!

## Answer This Question

## Related Questions

- trigonometry - A sector AOB of a circle, centre O, radius r cm, where the acute ...
- trig - In a circle of radius 12 inches, a sector is formed by a central angle of...
- maths - please can some one help me..? Part a - O is the centre of the circle, ...
- trigonometry - please check my answers. 1.Find the area of the sector of a ...
- maths - find the angle of a sector of a circle of radius 35cm is 288' find the ...
- TRIG HELP ASAP - I really need help on this problem. A sector has area of 15 in^...
- pre-calc - Find an angle between 0 and 2ð that is coterminal with the given ...
- math - An angle of 1.8 radians at the center of the circle subtends an arc of ...
- maths geomentry help!!! - the area of a sector PQR is a @rad.and the radius of ...
- Trig - Find the area of a sector with the given central angle θ in a circle...

More Related Questions