Christie Wong's answer to li ann's Secondary 2 Maths Singapore question.
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Cos 70 = x/7 where x is A to the perpendicular line
x=7cos 70
DC=AB-2x
DC=20-2(7cos70)
=15.2 cm
x=7cos 70
DC=AB-2x
DC=20-2(7cos70)
=15.2 cm
Date Posted:
2 years ago
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