Question

what is true regarding two adjacent arcs created by two intersecting diameters?
the sum of their measures is 180°.
they always have equal measures.
the difference of their measures is 90°.
their measures cannot be equal.

Explanation:

Step1: Recall circle - arc property

The sum of the measures of arcs that make up a semi - circle is 180°. When two diameters intersect, they divide the circle into two semi - circles. Adjacent arcs created by two intersecting diameters lie on a semi - circle.

Answer:

The sum of their measures is 180°.