36. Three cubes each of side 5 cm a...
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36. Three cubes each of side 5 cm are joined end to end. What is the surface area of the resulting cuboid? (1) 300 cm2 (3) 375 cm? (2) 350 cm? (4) 400 cm2

11th - 12th Class
Maths
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36. (2) Side of cube ( a=5 mathrm{cm} ) (given) and Length of cuboid ( l=(5+5+5)=15 mathrm{cm} ) ( b=5 mathrm{cm}, h=5 mathrm{cm} ) ( therefore ) Surface Area of cuboid ( =2(1 times b+b times h+1 times h) ) ( =2 times(15 times 5+5 times 5+15 times 5) ) ( =2 times(75+25+75) ) ( =2 times 175=350 mathrm{cm}^{2} )
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