Two cubes, each of side 15 cm are joined end to end. What is the surface area of the resulting cuboid?

1 Answer
sjc
Nov 20, 2017

surface area#=2250cm^2#

Explanation:

if two cubes of length #15cm# are joined, the resulting cuboid will be of dimensions

#30cm" by " 15cm" by "15cm#

see diagram below

enter image source here

surface area will be

each end #=rarr15xx15=225cm^2#

one top/bottom#=rarr30xx15=450cm^2#

each side#rarr30xx15=450cm^2#

total surface area#=2xx(450+450+225)#

surface area#=2xx1125=2250cm^2#

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