Question

A coin of radius 28mm . What is the area in (a) mm2 (b) cm2 ?​

Answer 1

Answer:

27.69

Explanation:

A body covers first one-third of the distance with a velocity of 30 msl and

Answer 2

$\huge\mathfrak{\fcolorbox{aqua}{azure}{\red{Question᭄}}}$

A coin of radius 28mm . What is the area in

(a) $mm^2$

(b) $cm^2$

$\huge\mathfrak{\fcolorbox{aqua}{azure}{\red{Solution᭄}}}$

As we know that,

Radius of coin = 28mm

What to find?

Area in $\bold{mm^2}$ and $\bold{cm^2}$

$\huge \mathfrak \blue {Area \: in \: mm^2}$

Area of circle = $\pi{r^2}$

$\implies$ $\frac {22}{7} \: × \: 28^2$

$\implies$ $\bold2464 \: mm^2$

Thus, area in $mm^2$ is $2464 \: mm^2$

$\huge \mathfrak \blue {Area \: in \: cm^2}$

Area of circle = $\pi{r^2}$

$\implies$ $\frac {22}{7} \: × \: 28^2$

$\implies$ $\bold2464 \: mm^2$

$\bold \color{aqua}{Converting \: mm^2 \: into \: cm^2}$

$\implies$ $100mm^2 \: = \: 1cm^2$

$\implies$ $2464mm^2 \: = \: 24.64cm^2$

Thus, Area of coin in $cm^2$ is $24.64cm^2$