a = 1/2 r^2 θ
so plug in your numbers ...
The arc of a circle of radius 20cm subtends an angle of 120degree at the centre.use the value 3.142 for the area of the sector correct to the nearent cm2
2 answers
area of whole circle = pi r^2
area of 120/360 of circle = 1/3 of whole circle
area of 120/360 of circle = 1/3 of whole circle
9 answers