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Because that is what a straight line (or straight angle) is.

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14y ago

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Related Questions

When 2 straight lines intersect the sum of the adjacent angles equals?

180 degrees


What are two adjacent angles that measure 180?

If the angles are EACH 180 degrees and they are placed adjacent, then they forma complete revolution of 360 degrees.If the two angles add up to 180 degrees when they are placed adjacent, then they aresupplementary angles.


What are adjacent supplementary angles?

The adjacent Supplementary angles are the sum of 2 angles that make 180 degrees.


ABCD is a quadrilateral.does a plus b plus c plus d equals 180 degrees?

No, it equals 360. All interior angles for any quadrilateral are always 360. Usually adjacent angles add up to 180 degrees.


What is the sum of adjacent angles in a paralellogram?

180 degrees.


What are two adjacent angles that measure 180 degrees called?

Sum of adjacent angles on a straight line.


What are two angels with a sum of 180 degrees called?

Two angles that sum to 180 degrees are called supplementary angles. This means that when the measures of the two angles are added together, they equal 180 degrees. Supplementary angles can be adjacent (forming a straight line) or non-adjacent.


Sum of two adjacent angles of pallelogram?

180 Degrees


Which are the two adjacent angles which are supplementary form what?

Supplementary adjacent angles add up to 180 degrees


What is the sum of two adjacent angles is 180 degrees?

When the sum of two adjacent angles is 180 degrees, they are referred to as supplementary angles. These angles share a common vertex and a side, lying next to each other. In geometric terms, if angle A and angle B are adjacent and their measures add up to 180 degrees, then A + B = 180°. This relationship is commonly observed in straight angles and many geometric figures.


Two adjacent angles that form a straight line?

they are called supplementary angles. a straight line has 180 degrees each side and two adjacent angles forming 180 degrees are called supplementary angles.


What are two angles called whose sum is 180 degrees?

Two angles whose sum is 180 degrees are called supplementary angles. When two angles are supplementary, it means that the sum of their measures equals 180 degrees. This relationship is often used in geometry to solve for unknown angles or to identify complementary angles.