Two rectangles H and J, not drawn to scale, overlap at K. K is the shaded area which is
13 of Rectangle H and
16 of Rectangle J. If the length of Rectangle H is 15 cm and its breadth is 6 cm, what is the area of the unshaded part of rectangles H and J?
| |
H |
J |
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 H and J is the same.
Area of Rectangle H
= 15 x 6
= 90 cm
2 Area of Rectangle H = 3 u
Area of Rectangle J = 6 u
3 u = 90
1 u = 90 ÷ 3 = 30
Area of unshaded parts of rectangles H and J
= 2 u + 5 u
= 7 u
= 7 x 30
= 210 cm
2 Answer(s): 210 cm
2 
