Number of plane angles of points and lines in high school mathematics, - Training Enrollment Network

Number of plane angles of points and lines in high school mathematics,

Solution: connect AD 1, AC, BC 1.

∫M, n is the midpoint of CC 1 and BC.

∴ MN//BC 1

Also: BC1/ad1

∴ MN//AD 1

The angle between Mn and CD 1 is equal to the angle between AD 1 and CD 1.

AC= AD 1=AC in △AD 1C。

The out-of-plane straight line CD 1 forms an angle of 60 with MN.

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