Two rectangles K and L, not drawn to scale, overlap at M. M is the shaded area which is
12 of Rectangle K and
14 of Rectangle L. If the length of Rectangle K is 12 cm and its breadth is 5 cm, what is the area of the unshaded part of rectangles K and L?
|
K |
L |
Difference |
Total areas |
2 u |
4 u |
2 u |
Shaded part |
- 1 u |
- 1 u |
|
Unshaded parts |
1 u |
3 u |
2 u |
The overlapping shaded part of rectangles K and L is the same.
Area of Rectangle K
= 12 x 5
= 60 cm
2 Area of Rectangle K = 2 u
Area of Rectangle L = 4 u
2 u = 60
1 u = 60 ÷ 2 = 30
Area of unshaded parts of rectangles K and L
= 1 u + 3 u
= 4 u
= 4 x 30
= 120 cm
2 Answer(s): 120 cm
2