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Mathematics 7 Online
OpenStudy (anonymous):

Descriptive geometry -Monge projection-. How to prove that the inclination angle on horizontal plane + inclination angle on vertical plane =< 90 degree.

OpenStudy (yamyam70):

is there any drawing ?

OpenStudy (anonymous):

|dw:1417615379214:dw| 1 + 2 < = 90 degree.

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