Traditional Culture Encyclopedia - Traditional festivals - The proof of parallelism in high school mathematics solid geometry, please explain how and why the auxiliary lines are connected.
The proof of parallelism in high school mathematics solid geometry, please explain how and why the auxiliary lines are connected.
Connect AN, extend the intersection BC to point P, and then connect SP.
Then SP is in the plane SBC, which proves that MN‖SP.
It can be proved that in MN‖ plane SBC
Prove:
In parallelogram ABCD
From BC.
so
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