Question

two cubes each of length of Edge B units are joined end to end find the total surface area of cube​

Answer 1

Answer:

11B^2

Step-by-step explanation:

SA(cube)=6s^2

SA(cube1)=6B^2

SA(cube2)=6B^2

Total SA=12*B^2

But sa one side is common, total SA is TSA-2s^2.

So, TSA=(12B^2)-(2B^2)

TSA=10*(B^2)

Answer 2

Answer:

After joining the two cubes of edge B units

then length is doubled and breadth and height remain same

hence length= 2B breadth= height= B

therefore TSA of cuboid is equal to 2(lb+bh+lh)= 2(2B(B)+ B*B+ 2B((B))= 2(2B²+B²+2B²)

= 2(5B)²= 10 B²