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Prolog looping due to interdependency

Prolog looping due to interdependency

Prolog looping due to interdependency

(OP)
Have to write some prolog rules to represent the geometrical properties about isosceles triangle.

First rule is to say

CODE -->

angleEqual(angle(A,B,C),angle(A,C,B)):- 
    triangle(A,B,C), 
    lineEqual(line(A,B),line(A,C)). 

Second rule says

CODE -->

lineEqual(line(A,B),line(A,C)):- 
    triangle(A,B,C), 
    angleEqual(angle(A,B,C),angle(A,C,B)). 

But the two rules together will cause a interdependency and prolog is looping forever if given facts such as

CODE -->

triangle(a,b,c).
lineEqual(line(a,b),line(a,c)). 


and query about

CODE

?- angleEqual(A,B). 


Any idea? Thanks very much.

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