2. The figure shows a right triangular prism. (a) Find the projection of line segment AC on plane CDEF. F (b) Find the projection of line segment AC on plane CFB. (c) Find the total number of the right angles in the triangular prism. (d) Find the angle between line segment AC and plane ABFE. (e) Find the angle between planes ABCD and ABFE. A B.

Q: B (2х — 10)° E (х + 30)°

A: The arc formed by the central angle is equal to the central angle.∠ACB=2x-10∠ECD=x+30

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