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Finding angles from a different viewpoint (java)
Time:2008/3/26 21:2:43,Hit rate:0

Try to find the marked angles by dragging the red points.

Sometimes, angles that are difficult to be found by calculation can be found easily by observation. This is done by looking at the problem from a different viewpoint.

Problem 1

△OAB and △OCD are equilateral triangles.
Find ∠DEC.		 
Problem 2
△OAB and △OCD are equilateral triangles.
Find ∠DEC.		 

Problem 3
OABC and ODEF are squares.
Find the ∠FGD.       

 
Problem 4
OABC and ODEF are squares.
Find the ∠FGD.		 
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