Question

10*π*(25*10^-5)^2 whole divided by / 1.6*10^-8

Answer 1

=(10×π×25×10^-5×25×10^-5)/(1.6×10^-8)

=(10×π×625×10^-10)/(1.6×10^-8)

= 6.25×π×625×10^-2

=6.25×6.25×π

=39.0625π = 122.65 (approx.)

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Answer 2

$\frac{ 10 \times \pi \times (25 \times {10}^{ - 5} )^{2} }{1.6 \times {10}^{ - 8} }$

$= > \frac{10\pi \times (25 \times {10}^{ - 5}) ^{2} }{1.6 \times {10}^{ - 8} }$

$= \frac{ {10}^{9} \pi \times \: 625 \times {10}^{ - 10} }{ \frac{8}{5} }$

$= \frac{3125 \times {10}^{ - 1}\pi }{8}$

$= \frac{3125\pi}{8 \times 10}$

$= \frac{625\pi}{8 \times 10}$

$= \frac{625\pi}{16}$

Alternative Form:-

$\frac{28125}{4} = 122.71845$

If not understand attachment is given above..

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