Find the cost of paintingin rupees a cuboid of dimensions 20cm - 15 cm - 12 cm at the rate of 5 paisa per square centimeter

R.E.F imageSurface area = 2(lb+bh+lh) = 2(20× 15+15× 12+20× 12) = 600+360+480 = 1440 cm^2 Cost = 1440 cm^2 = 0.02 Rscm^2 = 72 Rs #160 ...

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Standard VIII

Mathematics

Total Surface Area of a Cuboid

Find the cost...

Question

Find the cost of painting(in rupees) a cuboid of dimensions $20 c m \times 15 c m \times 12 c m$ at the rate of $5$ paisa per square centimeter

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Solution

R.E.F image
Surface area
$= 2 (l b + b h + l h)$
$= 2 (20 \times 15 + 15 \times 12 + 20 \times 12)$
$= 600 + 360 + 480$
$= 1440 c m^{2}$
Cost $= 1440 c m^{2} = \frac{0.02 R s}{c m^{2}} = 72 R s$

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Find the cost of painting(in rupees) a cuboid of dimensions 20cm×15cm×12cm at the rate of 5 paisa per square centimeter

R.E.F imageSurface area=2(lb+bh+lh)=2(20×15+15×12+20×12)=600+360+480=1440cm2Cost =1440cm2=0.02Rscm2=72Rs

Find the cost of painting(in rupees) a cuboid of dimensions $20 c m \times 15 c m \times 12 c m$ at the rate of $5$ paisa per square centimeter

R.E.F image
Surface area
$= 2 (l b + b h + l h)$
$= 2 (20 \times 15 + 15 \times 12 + 20 \times 12)$
$= 600 + 360 + 480$
$= 1440 c m^{2}$
Cost $= 1440 c m^{2} = \frac{0.02 R s}{c m^{2}} = 72 R s$