They are arcs of congruent circles.
Not unless the chords are both diameters.
true
15pi. after you add.
If they're in the same circle or in circles of equal radii (radiuses), then yes.
They are arcs of congruent circles.
In the same circle, or in congruent circles, two minor arcs are congruent if and only if their corresponding chords are congruent.
Not unless the chords are both diameters.
Only if they belong to congruent circles.
true
Arcs are part of a circumference of a circle cut into pieces by chords, tangents, secants, etc.
Sometimes
It is the measure of half the intercepted arc.
15pi. after you add.
If they're in the same circle or in circles of equal radii (radiuses), then yes.
If two chords intersect inside a circle, the acute angle they form is one half of the sum of the arcs intercepted by its sides and by the vertical angle SO... The acute angle will be one half the sum of the two arcs. So it is 1/2(42+94)=68 degrees.
They are simply called intersecting arcs.