Question

Find the area of a sector of circle of radius 21cm and the central angle 120°

Answer 1

HI Mate!!!.

Area of sector =( 120 / 360 ) × 3.14 × (10.5)²cm²

115.39cm²




Have a great future ahead..

Answer 2

$we \: know \: \\ \\ area \: of \: sector \: of \: circle = \\ \\ = \frac{given \: angle}{360 {}^{0} } \times \pi {r}^{2} \\ \\ here \: r = 21cm \\ \\ given \: angle = 120 {}^{0} \\ \\ = \frac{120 {}^{0} }{ {360}^{0} } \times \frac{22}{7} \times {21}^{2} \\ \\ = \frac{1}{3} \times \frac{22}{7} \times 21 \times 21 \\ \\ = \frac{22 \times 21 \times 21}{7 \times 3} \\ \\ = 22 \times 21 \\ \\ = 462 \: cm {}^{2} \\ \\ hope \: this \: helps \: you$