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primary 5 | Maths
| Area & Volume
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Date Posted: 6 years ago
Views: 628
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
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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Hope this helps
Date Posted:
6 years ago
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