Final answer:
The measure of a straight line is 180 degrees, equivalent to the sum of all three angles in a triangle or two right angles combined.
Step-by-step explanation:
The measure of a straight line is 180 degrees.
In a triangle, the sum of all three angles is always 180 degrees. This means that each angle inside a triangle must measure less than 180 degrees. So, for a straight line, which is made up of two angles each measuring 180 degrees, the total measure is 360 degrees.
Therefore, the measure of a straight line is 360 degrees.