Geometry — lines, angles, classifying shapes
Parallel and perpendicular lines. Right, acute, and obtuse angles. Classify triangles and quadrilaterals by sides and angles.
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Available exercises
Classify the quadrilateral
Name the quadrilateral by looking at its sides and angles.
Classify a triangle by its angles
Decide whether the triangle is acute, right or obtuse.
Parallel, perpendicular or intersecting?
Look at two lines and decide their relationship.
Classify polygons
Name the polygon by its number of sides — triangle, quadrilateral, pentagon, hexagon.
Right, acute and obtuse angles
Recognise right angles and classify other angles as acute or obtuse.