True or False :
The z-axis is at right angles to the planes x = 0 and y = 0.

What is the angle between the planes x+y=0 and z=0 .

Find the angle between the planes 2x+y+z-1=0 and 3x+y+2z-2=0 ,

Find the angle between two planes 2x+y-5z=0 and 4x -3y+7z=0

True or False statements: The angle between the tangents to the curves y = x^2 and x = y^2 at the point (0,0) is pi/2

Say True or False: Each angle of a rectangle is a right anlge.

True or false The line x=y=z lies in the plane x-2y+z-1=0.

The line (x-x_1)/a=(y-y_1)/b=(z-z_1)/c is at right angles to the plane Ax+By+Cz+D=0 if

True or False statements: Tangent to the curve y = x^2 at x = 0 is parallel to the x-axis.

Find the equation of the image of the plane x-2y+2z-3=0 in plane x+y+z-1=0.