A straight angle is an angle that measures exactly 180 degrees. It is formed when two rays point in opposite directions, creating a straight line. In geometric terms, a straight angle divides a plane into two equal halves, making it a fundamental concept in both geometry and trigonometry. Straight angles are often represented in diagrams as a straight line with a point at the vertex. They are important in various fields, including architecture, engineering, and art, as they help in understanding shapes, structures, and designs that require precise measurements and alignments.