K.Binks
  • K.Binks
Find angle A if DE is equal to 66 degrees and BC is equal to 23 degrees.
Mathematics
jamiebookeater
  • jamiebookeater
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K.Binks
  • K.Binks
ikram002p
  • ikram002p
|dw:1438614978271:dw|
K.Binks
  • K.Binks
But how do I solve for A?

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anonymous
  • anonymous
sorry, the angle DCE is 33°, CDB is 23°/2, show the triangle ACD
anonymous
  • anonymous
the relation, DCE (external) is CDB + A
ikram002p
  • ikram002p
use this formula :- |AE| |CE|=|AD| |BD|
phi
  • phi
angle A is 1/2 the difference between the two intercepted arcs. in other words \[ \angle A= \frac{1}{2}( \widehat{DE}- \widehat{BC})\]
anonymous
  • anonymous
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K.Binks
  • K.Binks
A=4?

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