2010008706

SubArea:

Level:

Project ID:

2010008706

Source Problem:

Accepted:

Clonable:

Easy:

A cube

A B C D E F G H

with an edge length of

4

units is placed in a coordinate system (see the picture). Find an angle

ψ

between the plane

ρ

passing through the points

B

D

and

H

and the straight line

C F

. Hint: An angle between a line and a plane is an angle between the line and its orthogonal projection into this plane.

ψ = \frac{π}{6}

ψ = \frac{π}{12}

ψ = \frac{π}{4}

ψ = \frac{π}{3}

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