Perimeter of the sector = 2r+θ360∘×2πr2r + \frac{\theta}{360^{\circ}} \times 2\pi r2r+360∘θ×2πr
= 2(10.5)+120360×2×227×10.52(10.5) + \frac{120}{360} \times 2 \times \frac{22}{7} \times 10.52(10.5)+360120×2×722×10.5
= 21+2221 + 2221+22
= 43 cm
