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primary 5 | Maths | Area & Volume
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primary 5 chevron_right Maths chevron_right Area & Volume

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Date Posted: 1 year ago
Views: 130
1 year ago
Area of triangle = 1/2 x base x height

From the figure you can see 3 shaded triangles.

Note that the 3 shaded triangles have the same height, 10cm. (Because they all touch the top part of the square, and the square is 10cm by 10cm)

Area of the 3 shaded triangles

= 1/2 x base of 1st triangle x 10cm +
1/2 x base of 2nd triangle x 10cm +
1/2 x base of 3rd triangle x 10cm

= 1/2 x 10cm x (bases of 1st triangle + 2nd + 3rd triangle)

Notice that the bases occupy the length of all three squares. So this means the total length of the bases is 3 x 10cm = 30cm

So, area of the 3 triangles = 1/2 x 10cm x 30cm = 150cm²

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Susan Chan
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