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Adjacent Arcs
Circles have infinitely many arcs, not just 3.
No
Diameter
Trefoil
Major arc is the longer of two arcs.
Yes, there can be congruent arcs on a circle. Arcs which subtend the same angle at the center are considered as congruent.
Congruent Arcs
Half of the circle is an arc
Divide the arc's degree measure by 360°, then multiply by the circumference of the circle.
Because they are parts of the circumference of a circle
In the same circle, or in congruent circles, two minor arcs are congruent if and only if their corresponding chords are congruent.