Question

9. Two cubes, each of side 15 cm are joined end to end. Find the surface area of the resulting cuboid​

Answer 1

Answer:

If 2 cubes come together end to end resulting shape will be cuboid of dimension

length =12+12=24 cm

breadth =12 cm

height =12 cm

∴ Surface area =2[lb+bh+hl]

=2[24×12+12×12+12×24]

=2[288+144+288]

=2×720

=1440 cm

2

Answer 2

Answer:

Explanation:

if two cubes of length

15

c

m

are joined, the resulting cuboid will be of dimensions

30

c

m

by

15

c

m

by

15

c

m

see diagram below

enter image source here

surface area will be

each end

=

→

15

×

15

=

225

c

m

2

one top/bottom

=

→

30

×

15

=

450

c

m

2

each side

→

30

×

15

=

450

c

m

2

total surface area

=

2

×

(

450

+

450

+

225

)

surface area

=

2

×

1125

=

2250

c

m

2