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24.15.13  Checking whether two circles in the plane are orthogonal

See Section 25.11.5 for checking for orthogonality in three-dimensional geometry.

The is_orthogonal command determines whether or not two lines or circles are orthogonal.

Examples

is_orthogonal(line(0,1+i),line(i,1))
     
1           
is_orthogonal(line(2,i),line(0,1+i))
     
0           
is_orthogonal(circle(0,1+i),circle(2,1+i))
     
1           
is_orthogonal(circle(0,1),circle(2,1))
     
0           

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