Question

Two cubes each of side 8cm are joined end to end.Find the surface area of the resulting cuboid.

Answer 1

Edge of cube = 8cm
Length of the cuboid after joining = 8+8 =  16cm
Breadth of the cuboid = 8cm
Height of the cuboid = 8cm

Surface area of the cuboid
= 2 (lb+lh+bh)
= 2 (16*8 + 16*8 + 8*8 )
= 2 (128+128+64)
= 2 (320)
= 640 cm²

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Answer 2

EDGE OF CUBE= 8cm

VOLUME OF CUBE = a³ = (8)³ = 512 cm³

LENGTH OF RESULTING CUBOID = 8+8 = 16 cm

BREADTH OF RESULTING CUBOID = 8 CM

HEIGHT OF RESULTING CUBOID = 8CM

TSA OF RESULTING CUBOID = 2(LB+BH+HL)

= 2(16×8+8×8+8×16)

= 2( 128+64+128) = 2×320 = 640 cm³