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.
Showing posts with label M Angles P5. Show all posts
Showing posts with label M Angles P5. Show all posts
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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