Question

14. Three cubes cach of side 5 cm are joined
end to end. Find the surface area of the
resulting solid,​

Answer 1

Answer:

350cm²

Step-by-step explanation:

Three cubes joined end-to-end form a cuboid, where

length is 5 + 5 + 5 = 15 cm

height = still same = 5 cm

breadth = still same = 5 cm  

Surface area of cuboid = 2(lb + bh + hl)

     = 2(15*5 + 5*5 + 15*5) cm²

     = 2(75 + 25 + 75) cm²

      = 350 cm²

Answer 2

Given :-

Three cubes of 5 cm

To Find :-

SA

Solution :-

Total length =  5 + 5 + 5 = 15

$\sf TSA =2(lb + bh + lh)$

$\sf TSA = 2(15 \times 5 + 5 \times 5 + 15 \times 5)$

$\sf TSA = 2(75 + 25 + 75)$

$\sf TSA = 2(175)$

TSA = 350 cm sq