Question

Radius =4.2cm,Area=?

Answer 1

Area of a circle = 2 pie radius²
2x22/7x4.2x4.2 = 110.88cm²

Answer 2

Area of a circle = r ×(radius)^2
Which is 22/7 × (radius)^2

= given radius is 2 and pie(r) is 22/7
$22 \div 7 \times {4.2}^{2}$
22/7×4.2×4.2
=
$\pi \times 4.2 \times 4.2$
22/7×17.64
=22×2.52
=55.44 cm square(ANS)