Question

A cylindrical pipe has an outer diameter of 14cm and inner diameter of 11.2 CM its length is 20 cm find the volume of water it can hold in litre

Answer 1

height of the cylindrical pipe = 20 cm


Outer diameter = 14 cm

so, outer radius (R) =
$\frac{14}{2} = 7 \: cm$
now, inner diameter = 11.2 cm

inner radius (r) =
$\frac{11.2}{2} = 5.6 \: cm$

therefore,

$volume \: of \: pipe = volume \: of \\ \: outer \: cylinder - volume \: of \\ \: inner \: cylinder \\ \\ =\pi {R}^{2} h \: - \:\pi {r}^{2} h \\ = \pi( R {}^{2} - {r}^{2} )h \\ \\ = \frac{22}{7}( {7}^{2} - {5.6}^{2} )20 \\ \\ = \frac{22}{7}(7 + 5.6)(7 - 5.6)20 \\ \\ = \frac{22}{7} \times 12.6 \times 1.4 \times 20 \\ \\ = 1108.8 \: {cm}^{3}$
therefore , the volume is 1108.8 cm³



✨PLEASE MARK IT AS BRAINLIEST✨

Answer 2

Answer:

1971.2 cm^3 or 1.97 litre

Step-by-step explanation:

YOUR ANSWER IS IN ATTACHMENT OUTER VOLUME IS PACKED SO ITS NOT YOUR'S VOLUME OK

HOPE ITS HELPFUL