hello!! is the perimeter of a sector (angle)/360 x pi x (radius) x 2 ? thanks! also, what is the formula for the area of a sector? i left my book with everything in it at school, bad move.
+33661 1. Perimeter
Yes, though it can be expressed more simply. If s is arc length (i.e. perimeter of sector), r is radius and θ is angle of sector then: s = r*θ where θ is in radians (s = r*θ*pi/180 if θ is in degrees: this is the equivalent of your expression: s = r*θ*2pi/360)
2. Area
Area of sector = (θ/360)*pi*r^2 (if θ is in degrees).
(I've assumed you are talking about the sector of a circle)
.
+33661 1. Perimeter
Yes, though it can be expressed more simply. If s is arc length (i.e. perimeter of sector), r is radius and θ is angle of sector then: s = r*θ where θ is in radians (s = r*θ*pi/180 if θ is in degrees: this is the equivalent of your expression: s = r*θ*2pi/360)
2. Area
Area of sector = (θ/360)*pi*r^2 (if θ is in degrees).
(I've assumed you are talking about the sector of a circle)
.
