Question: Find angle between planes in degrees

using the package geom3d

if I define two planes and attempt to find angle between them.

p1: 12-6*x-6*y-4*z = 0

p2: 3*x+3*y+2*z-6=0

 

and use the command FindAngle(p1,p2) then it returns arccos(2/11) any way to force maple to return a result in degree?

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