Question

pls...answer me.....I want to check whether my answer is correct or not........

Answer 1

h = 24cm, r1 = 15cm, r2 = 5cm

sheet required to make bucket is

$\pi(r1 + r2)l \: + \pi \: r2 {}^{2}$

$\pi((r1 + r2)l \: + \: r2 {}^{2} )$

First we need to find l which is given by

$l = \sqrt{(r1 - r2) {}^{2} + h {}^{2} }$

$l = \sqrt{(15 - 5) {}^{2} + 24 {}^{2} }$

$l = \sqrt{100 + 576} = \sqrt{676}$

$l = 26cm$

Now put value of l in formula...

$3.14((15 + 5)26 + 5 {}^{2} )$

$3.14(520 + 25)$

$3.14 \times 545$

$= 1711.3cm {}^{2}$

$cost \: of \: 100cm {}^{2} \: is \: 10rs$

$(1711.3 \times 10) \div 100$

$cost \: is \: 171.13 \: rs$