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Geometry problem - understanding triangles

See attached pdf file for problem and diagram regarding angles.


Solution Preview

Please refer to the attached figure as you read on..

from the figure, Angle XAC = Angle ACF
This is using the fact that, a straight line falling on parallel straight lines makes the alternate angles equal to one another, ...

Solution Summary

The problem is solved giving all necessary mathematical steps. It will enable you to do similar problems yourself.