13a. The figure below is made up of unit squares. What fraction of the figure is shaded? [1]
1/2 x 3 x 4 = 6
½ x 2 x 1 = 1
1 + 6 = 7
5 x 4 = 20
7/20
13b. The figure below is not drawn to scale. Given that the area of WXYZ is 40 cm2, find the area of the shaded part. [3]
The two shaded triangles may be adjusted to form a big triangle (base 12 cm and height 18 cm) such that they do not overlap.
1/2 x 12 x 18 = 108
108 – 40 = 68 cm2
The area of the shaded part is 68 cm2.
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