A straight line is a geometric figure that extends infinitely in both directions without any curves or bends. It has no angles other than 180 degrees.
Geometric shape: This term refers to the characteristics and properties of different shapes, such as lines, triangles, circles, etc.
Euclidean geometry: This term refers to a branch of mathematics that deals with flat shapes and measurements.
Parallel lines: This term refers to two or more lines that never intersect each other and remain equidistant at all points.