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primary 5 | Maths
| Angles & Geometry
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area BCD = 0.5x3x4 = 6 cm²
area DEF = 0.5x2x5 = 5 cm²
area ACDE = 5 x 4 = 20 cm²
area of shaded triangle
= 20 - 2 - 6 - 5 = 7 cm²
...
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