Question

Calculate the perimeter and area of a quadrant of the circle whose radii are 70cm

Answer 1

A quadrant of a circle means one-fourth of circle. Given, radius, r = 70 cm
$perimeter = \frac{1}{4} \times 2\pi \: r \\ = \frac{1}{4} \times 2 \times \frac{22}{7} \times 70 = 110 \: cm$
$area = \frac{1}{4} \times \pi {r}^{2} \\ \frac{1}{4} \times \frac{22}{7} \times {70}^{2} = 3850 \: {cm}^{2}$