Two rectangles C and D, not drawn to scale, overlap at E. E is the shaded area which is
12 of Rectangle C and
19 of Rectangle D. If the length of Rectangle C is 7 cm and its breadth is 4 cm, what is the area of the unshaded part of rectangles C and D?
|
C |
D |
Difference |
Total areas |
2 u |
9 u |
7 u |
Shaded part |
- 1 u |
- 1 u |
|
Unshaded parts |
1 u |
8 u |
7 u |
The overlapping shaded part of rectangles C and D is the same.
Area of Rectangle C
= 7 x 4
= 28 cm
2 Area of Rectangle C = 2 u
Area of Rectangle D = 9 u
2 u = 28
1 u = 28 ÷ 2 = 14
Area of unshaded parts of rectangles C and D
= 1 u + 8 u
= 9 u
= 9 x 14
= 126 cm
2 Answer(s): 126 cm
2