Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
primary 6 | Maths
| Algebra
One Answer Below
Anyone can contribute an answer, even non-tutors.
Pls help. Tks
6 faces per cube x 6 cubes = 36 faces
Area of each face = area of square
= 3cm x 3cm
= 9cm²
However,
There are 5 intersections where the faces are not visible. In each of these intersections, 2 faces are blocked.
Total number of faces blocked = 5 x 2
= 10
Total number of exposed faces
= 36 - 10 = 26
Surface area
= 26 faces x 9cm²
= 234cm²
Alternative method :
Front view : 5 faces exposed.
Back view : 5 faces exposed.
Right view : 4 faces exposed
Left view : 4 faces exposed.
Top view : 4 faces exposed
Bottom view : 4 faces exposed
Total number of exposed faces
= 5+5+4+4+4+4
= 26
Surface area
= 9cm² x 26
= 234cm²
See 1 Answer