Question

three cubes of side 4 cm each are joined end to end . find the ratio of surface area of resulting to that of cube .​

Answer 1

Answer:

7:2

Step-by-step explanation:

the resulting cuboid has

l = 4*3 = 12cm             b = 4cm              h = 4cm

csa of the cuboid so formed = 2 (lb+bh+hl)

                                               = 2 (12*4 + 4*4+ 4*12)  = 224cm²

csa of cube = 4a² = 4*4*4 = 64cm²

csa of cuboid : csa of cube = 224:64

                                             = 7:2

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