Question

two cubes of side 4cm are fixed together find the total surface area of the new solid performed

Answer 1

New length =4+4=8cm. Breadth=4cm. Height=4cm. surface area of new solid formed =. 2(lb+bh+lh)=2(8×4+4×4+8×4)=2(32+16+32)=2×80=160cm square

Answer 2

Here, one side of cube = 4cm
One side of another cube = 4cm
Height = 4cm
Breadth = 4cm
New solid formed = side of 1st cube + side of 2nd cube

= (4+4)cm
= 8cm
Length = 8cm

Therefore, total surface area of cuboid (new solid formed by joining the 2 cubes) ,
= 2(lb+bh+hl)
= 2(8x4 + 4x4 + 4x8)
= 2(32+16+32)
= 2x80
= 160cm^2