GCSE Maths Practice: angles

The sum of angles on a straight line is 180°. This applies when two or more angles share a common vertex on a straight line. Knowing this allows students to calculate unknown angles in linear arrangements, parallel lines cut by a transversal, and polygons. In practice, identifying angles on a straight line helps with construction, architecture, and problem-solving in geometry. Recognizing that a straight angle is 180° supports understanding supplementary angles, triangle angle calculations, and complex diagrams. Practicing with diagrams reinforces the ability to quickly identify straight line angles and solve problems efficiently. This principle is fundamental for GCSE geometry and real-life applications where straight edges and aligned structures are involved.