# Math

A sector of a circle has a radius 5cm
The area of the sector is 5π
Work out the arc length

1. s = rθ

so, what's θ?

1/2 r^2 θ = 5π

posted by Steve

## Similar Questions

1. ### Mathmatics

A sector of a circle of radius 9 cm subtends angle 120 at center of the circle find the area of the sector to the nearest cm
2. ### How do i do this maths question??

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,
3. ### math

A sector of a circle subtending an angle 300 degrees at the centre is used to form a cone with base radius 6cm. Find the (a.)radius of the circle (b.)volume of the cone (c.)area of the minor sector of the circle
4. ### Calculus1

The radius of a sector of a circle is increasing at a rate of 3 cm/sec while the area is decreasing at a rate of 1 cm2/sec. At what rate is the angle of the sector changing when the area is 20 cm2 and the radius os 5cm?
5. ### trigonometry

A sector AOB of a circle, centre O, radius r cm, where the acute angle AOB is theta radians. Given that the perimeter of the sector is 14 cm and that the area of the sector is 10 cm^2, evaluate r and theta.
6. ### math

area of a sector of a circle of radius 36 cm is 54 pie cm square . find the length of the corresponding arc of the sector
7. ### maths geomentry help!!!

the area of a sector PQR is a @rad.and the radius of the of the circle is rcm,the area of the sector is 20cm^2 and the perimeter is 26cm.find r?
8. ### math

A sector in a circle of radius 8.1 m has an area of 53.5 m^2. The central angle in a sector must be _____o. Round to one decimal place.
9. ### TRIG HELP ASAP

I really need help on this problem. A sector has area of 15 in^2 and central angle of 0.2 radians. Find the radius of the circle and arc length of the sector
10. ### trigonometry

please check my answers. 1.Find the area of the sector of a circle. r=11.8cm, theta-pi/7 radians I got 31.2cmsquared 2.Find the radius of a circle in which a central angle of pi/6radian determines a sector of area 76square meters.

More Similar Questions