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Coordinate geometry

 Angle between two lines in space Angle between two planes in space Angle between a line and a plane The angle t between two lines is the angle between two direction vectors of the lines. Take line a with direction vector u and line b with direction vector v. That is: u.v= ||u||.||v||.cos(t) and then: The angle between two planes is given by the angle between the normal vectors, n1 and n2, that is: Let's name t to the angle which line makes with plane, v the direction vector of line and n the normal vector of the plane. Then:

Choose the angle between the line $\fs2s=\{\begin{eqnarray}+9y&=&9\\-3y&=&5\end{eqnarray}\\$ and the plane $\fs2\pi=4x+4y=5$

 13.63 17.53 9.37 11.2

The angle is given in degrees