ymmetrice a is congruent to triangle b and triangle bso dongruent to triangle eangie above relation on R is an equivalence relation5. If R ia relation from N to N defined by ta, byan eguicalence relation. It is given that (a, b) R (c, d) if an only if adta, b) et N × N, we have ab-ba !By eommula, b) R (a, b)flexiveコ(c, d) R (a, b)ymmetric

ymmetrice a is congruent to triangle b and triangle bso dongruent to t

1.	ymmetrice a is congruent to triangle b and triangle bso dongruent to triangle eangie above relation on R is an equivalence relation5. If R ia relation from N to N defined by ta, byan eguicalence relation. It is given that (a, b) R (c, d) if an only if adta, b) et N × N, we have ab-ba !By eommula, b) R (a, b)flexiveコ(c, d) R (a, b)ymmetric
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