Question

2 cubes of side 7cm are joined together.Find the T.S.A of the new solid formed

Answer 1

Answer:

390 cm sq.

Step-by-step explanation:

Answer 2

Given-

✿ Two cubes side(joined together)= 7 cm

To Find-

✿ Total Surface area of the new solid formed .i.e cuboid

Formula to be used-

✿ T.S.A of cuboid= 2(lb+lh+bh)

•T.S.A = Total Surface Area

•l = length

•b = breadth

•h = height

Step-by-step solution-

✿ New length= (2×7)cm = 14 cm

✿ New breadth= 7 cm

✿ New height= 7 cm

✿ T.S.A of cuboid= 2(lb+lh+bh)

✿ T.S.A of cuboid= 2[14*7+14*7+7*7]

✿ T.S.A of cuboid= [2×245]

✿ T.S.A of cuboid= 490 cm²