HY's answer to Mohd Iswady's Primary 5 Maths Angles & Geometry Singapore question.
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Since triangle ABD is equilateral, angle ADB=60°
Angle BDC = 180 - 60 = 120°
Angle CBD = 60 ÷ 2 = 30°
Angle BDC = 180 - 60 = 120°
Angle CBD = 60 ÷ 2 = 30°
Date Posted:
4 years ago
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