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.
It is the measure of half the intercepted arc.
Sometimes
15pi. after you add.
If they're in the same circle or in circles of equal radii (radiuses), then yes.
In a circle, the measure of an angle formed by two chords that intersect at a point inside the circle is equal to the average of the measures of the arcs intercepted by the angle. If angle ABC measures 134 degrees, it means that the angle is formed by the intersection of two chords, and the measure of the arcs it intercepts will average to this angle. Thus, angle ABC is 134 degrees.
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.