Sector of a circle:

Perimeter 115.1 cm

radius 25.4 cm

Calculate the angle:

I get 259, but the answer says 145.

I used this formula:

Sector Perimieter = theta/ 360 * 2*pi*r

Help!

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- Jun 3rd 2007, 03:49 AMGAdamsSector Angle
Sector of a circle:

Perimeter 115.1 cm

radius 25.4 cm

Calculate the angle:

I get 259, but the answer says 145.

I used this formula:

Sector Perimieter = theta/ 360 * 2*pi*r

Help! - Jun 3rd 2007, 04:57 AMPlato
You want the arc length.

But you are given the perimeter of the sector.

That includes the radius twice; substract 2r.