Two rectangles C and D, not drawn to scale, overlap at E. E is the shaded area which is
13 of Rectangle C and
16 of Rectangle D. If the length of Rectangle C is 12 m and its breadth is 3 m, what is the area of the unshaded part of rectangles C and D?
| |
C |
D |
Difference |
| Total areas |
3 u |
6 u |
3 u |
| Shaded part |
- 1 u |
- 1 u |
|
| Unshaded parts |
2 u |
5 u |
3 u |
The overlapping shaded part of rectangles C and D is the same.
Area of Rectangle C
= 12 x 3
= 36 m
2 Area of Rectangle C = 3 u
Area of Rectangle D = 6 u
3 u = 36
1 u = 36 ÷ 3 = 12
Area of unshaded parts of rectangles C and D
= 2 u + 5 u
= 7 u
= 7 x 12
= 84 m
2 Answer(s): 84 m
2 
