Lines, angles and labelling
Pages
Points, lines and planes
The vocabulary of geometry: points, line segments, vertices, edges, planes.
Labelling and drawing conventions
Naming a side AB and an angle ABC, and the hatch.
Parallel and perpendicular lines
Lines that never meet and lines that cross at 90°.
Naming angles by size
Acute, right, obtuse and reflex angles named by size.
Angles at a point
Angles meeting at a point sum to 360°.
Angles on a straight line
Angles on one side of a straight line sum to 180°.
Vertically opposite angles
Two crossing lines make two pairs of equal angles.
Practice
Practice
Angles at a point
Angles meeting at a point sum to 360°.
PracticeAngles on a straight line
Angles on one side of a straight line sum to 180°.
PracticeVertically opposite angles
Two crossing lines make two pairs of equal angles.
PracticeAngle rules review
Parallel lines and polygons, stating the reason each time.