Question

find the cost of painting 15 cylindrical pillars of a building at rupees 2.50per square metre if the diameter and height if each pillar are 48 cm and 7 metres respectively.

Answer 1

Here is the answer for your question

Answer 2

Answer:

$Cost\:of \:15\: cylindrical\\pillars = Rs\:396$

Step-by-step explanation:

$Dimensions \:of \: a\\ \:each\: cylindrical\:pillar:$

$Diameter (d)=48\:cm\\Radius(r)=\frac{d}{2}\\=\frac{48}{2}\\=24\:cm\\=0.24\:m$

$Height (h)=7\:m$

$Area\: of \: painting \: one \: pillar \\=2\pi rh$

$Area\: of \: painting \: 15\:such \: pillars\\=15\times 2\pi rh\\=15\times 2\times \frac{22}{7}\times 0.24\times 7\\=158.6 \:m^{2}$

$Cost\:of\: painting \\1\:m^{2} = Rs\:2.50$

$Cost\:of\: painting \\158.5\:m^{2} = Rs\:2.50\times 158.5\\=Rs\:396$

Therefore,

$Cost\:of \:15\: cylindrical\\pillars = Rs\:396$

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