Trefoil
Adjacent Arcs
No
Diameter
4 because there are 360 degrees around a circle
Trefoil
A circle divides a plane into three parts.
Yes, there can be congruent arcs on a circle. Arcs which subtend the same angle at the center are considered as congruent.
Congruent Arcs
Adjacent Arcs
Half of the circle is an arc
No
An arc is a portion of a circle. The default method for drawing arcs is to specify three points-the start point, a second point, and the endpoint. You can draw an arc using several different methods.
Because they are parts of the circumference of a circle
Diameter
In the same circle, or in congruent circles, two minor arcs are congruent if and only if their corresponding chords are congruent.
Major arc is the longer of two arcs.