Two rectangles H and J, not drawn to scale, overlap at K. K is the shaded area which is
12 of Rectangle H and
110 of Rectangle J. If the length of Rectangle H is 7 m and its breadth is 4 m, what is the area of the unshaded part of rectangles H and J?
| |
H |
J |
Difference |
| Total areas |
2 u |
10 u |
8 u |
| Shaded part |
- 1 u |
- 1 u |
|
| Unshaded parts |
1 u |
9 u |
8 u |
The overlapping shaded part of rectangles H and J is the same.
Area of Rectangle H
= 7 x 4
= 28 m
2 Area of Rectangle H = 2 u
Area of Rectangle J = 10 u
2 u = 28
1 u = 28 ÷ 2 = 14
Area of unshaded parts of rectangles H and J
= 1 u + 9 u
= 10 u
= 10 x 14
= 140 m
2 Answer(s): 140 m
2 
