 The figure is not drawn to scale. It is made up of a square and rectangle. The ratio of the area of the square to that of the rectangle is 1 : 3. After the grey part is cut out, the ratio of the area of unshaded part of the rectangle to that of the square is 5 : 1. Given the length of the square is 5 cm, find the area of the grey part.
2 m
The figure, not drawn to scale, on the right shows 2 rectangles overlapping each other. The ratio of the shaded area to the area of Rectangle A is 3 : 8. The ratio of the shaded area to the area of Rectangle B is 2 : 5. Find the ratio of the unshaded area to the total area of the figure. 2 m
The figure, not drawn to scale, on the right shows 2 rectangles overlapping each other. The ratio of the shaded area to the area of Rectangle X is 4 : 9. The ratio of the shaded area to the area of Rectangle Y is 3 : 6. Find the ratio of the unshaded area to the total area of the figure. 2 m
This figure is not drawn to scale. It is made up of 3 squares. The ratio of the area of the smallest square to the largest square is 2 : 9 while the shaded area is 37 of the unshaded area. What is the ratio of the shaded area to the area of the smallest square?
2 m
The figure is made up of a rectangle and a square. 79 of the square is unshaded and 16 of the rectangle is shaded. What fraction of the figure is shaded? 2 m
The figure is not drawn to scale. Three pentagons A, B and C are arranged as shown In the figure. The area of Pentagon A is 35 the area of Pentagon B. The area of Pentagon B is 35 the area of Pentagon C.
1. Find the ratio of the area of Pentagon A to the area of Pentagon C.
2. 23 of Pentagon A is shaded. What fraction of the whole figure is not shaded? 3 m
The figure, not drawn to scale, shows a rectangle, WXYZ, which is divided in 4 parts, A, B, C, D. The ratio of the area of D to the area of C is 1: 3. The ratio of the area of C to the area of B is 2:7. If the area of A is 238 cm2 , what is the area of the rectangle WXYZ? 3 m
The figure is made up of two squares and a triangle. The ratio of the area of Triangle X to that of Square Z is 11 : 1. The ratio of the shaded area to that of the unshaded area is 1 : 3. If the difference between areas of Triangle X and Square Y is 464 cm2, what is the area of Square Z? 3 m
PSLE
The shaded figure is formed by two identical circles with centres at A and C. ABCD is a square and the length of AB is 7 cm. Find the perimeter of the shaded figure. (Take π = 227) 2 m
X, Y and Z are centres of three identical circles. The length of XY is 7.2 m. XY, YZ and XZ are equal in length. Find the shaded area of the figure. (Take π = 3.14) Correct to 2 decimal places. 2 m