Wednesday, September 22, 2010

Angles P5 2009 SA2 ACS P2 Q11













180 - 60 = 120

120 / 2 = 60      A = B (folded)

180 - 90 - 60 = 30        C (Right-angled triangle)

180 - 30 - 30 - 20 - 20 = 80 degree  D = C ; E = 20 (folded)

It is 80 degree.

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