WT Cheng's answer to Keiko's Secondary 1 Maths Singapore question.
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Hi Keiko,
117° + x = 72° + 4x (ext.angle of triangle)
45° = 3x
x = 15°
117° + x = 72° + 4x (ext.angle of triangle)
45° = 3x
x = 15°
Date Posted:
3 years ago
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