Shawn's answer to yummy's Secondary 1 Maths Singapore question.
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Total exterior angle = 360°
Since it’s a regular polygon (all lengths and angles are equal),
n = 360/36=10 sided.
Each interior angle = 180-36=146° (adj angle on str line)
BDC = (180-146)/2=18° (isos)
BDE = 146-18=128° (adj angle)
DCE=BDC=18°
CXD= 180-18-18=146° (sum of angles in triangle)
BXE=CXD=146° (vert opp angle)
Since it’s a regular polygon (all lengths and angles are equal),
n = 360/36=10 sided.
Each interior angle = 180-36=146° (adj angle on str line)
BDC = (180-146)/2=18° (isos)
BDE = 146-18=128° (adj angle)
DCE=BDC=18°
CXD= 180-18-18=146° (sum of angles in triangle)
BXE=CXD=146° (vert opp angle)
Date Posted:
3 months ago
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