Complete the part of Position/Angle and problem 2 of IMO in 2007 #301
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Now, `ProjFig` and `DirFig` extends `ProjObj` and `DirObj` respectively.
and the relation of `inner` and `IsAcu`, `IsRight` and `IsObt`
And add definitions and basic properties of right triangles and obtuse triangles
mbkybky
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