Question

Area of a circle with radius 2.1cm

Answer 1

Area of circle =22/7*r*r
=22/7*2.1*2.1
=97.02/7
=13.86 cm²

Answer 2

$\huge\boxed{\texttt{\fcolorbox{Red}{aqua}{Hey Mate!!!}}}$

Radius = 2.1cm

Area of circle =
$= \pi \times r {}^{2} \\ = \frac{22}{7} \times 2.1 \times 2.1 \\ = 13.86cm {}^{2}$
Hope it helps you