DRDO Multi tasking staff Model paper 4

θ = 60° and r = 21 cm
Length of arc = (θ°/360°) × 2πr
Length of arc = (60/360) × 2 × (22/7) × 21
Length of arc = 22 cm
Since, Perimeter of the sector = length of arc + 2r
Therefore, Perimeter of the sector = 22 + (2 × 21) = 64 cm