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Question
primary 5 | Maths
| Angles & Geometry
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Total area of the biggest triangle (with base 15 cm and height 12 cm)
= 0.5 x 15 x 12
= 90 cm2
Since there are 9 identical equilateral triangles, each one measures 90 / 9 = 10 cm2.
Total area of shaded triangles
= 3 x 10
= 30 cm2
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