Two rectangles H and J, not drawn to scale, overlap at K. K is the shaded area which is
14 of Rectangle H and
19 of Rectangle J. If the length of Rectangle H is 12 m and its breadth is 7 m, what is the area of the unshaded part of rectangles H and J?
| |
H |
J |
Difference |
| Total areas |
4 u |
9 u |
5 u |
| Shaded part |
- 1 u |
- 1 u |
|
| Unshaded parts |
3 u |
8 u |
5 u |
The overlapping shaded part of rectangles H and J is the same.
Area of Rectangle H
= 12 x 7
= 84 m
2 Area of Rectangle H = 4 u
Area of Rectangle J = 9 u
4 u = 84
1 u = 84 ÷ 4 = 21
Area of unshaded parts of rectangles H and J
= 3 u + 8 u
= 11 u
= 11 x 21
= 231 m
2 Answer(s): 231 m
2 
