Wednesday, May 26, 2010

P6 Angles A001





/_ ABE = 60 o                  (ABE is an equilateral triangle)

/_ EBC = 80 o – 60 o
                   = 20 o

/_ FCB = /_ FBC     (Since the 3 sides of Triangles BCD and
                                  BCF are the same)
            = 20 o ÷ 2      (Since EC divides /_ ACB equally
                                   as ABE is an equilateral triangle)
            = 10 o

/_ BDC = 180 o – 20 o – 10 o
             = 150 o

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