Question

how are the semicircle and the diameter of a circle related?
the length of the diameter and the length of semicircle are the same.
the degree measure of the diameter and the degree measure of the semicircle are the same.
the angle measure of the diameter is twice the angle measure of the semicircle.
the angle measure of the diameter is half the angle measure of the semicircle.

Explanation:

A diameter is a straight line segment (180° angle measure as a straight angle), and a semicircle is the curved half of a circle, which also subtends a 180° central angle. The length of a semicircle is half the circle's circumference ($\pi r$) plus the diameter, so it differs from the diameter's length ($2r$). The other angle-related options are incorrect as both have a 180° measure.

Answer:

The degree measure of the diameter and the degree measure of the semicircle are the same.