Home › Subjects › O-Level Elementary Maths (E-Maths) › Angles, triangles and many-sided figures

O-Level Angles, triangles and many-sided figures

What the O-Level syllabus expects for Angles, triangles and many-sided figures, and how to practise it.

What the syllabus expects

angles classed as right, acute, obtuse or reflex
angles that are vertically opposite, angles sitting along a straight line, and angles clustered about a single point
the angles formed where a transversal cuts a pair of parallel lines, namely corresponding, alternate and interior angles
the properties (symmetry among them) of triangles, of the special quadrilaterals, and of regular polygons such as the pentagon, hexagon, octagon and decagon
grouping the special quadrilaterals by the properties they possess
for a convex polygon of any kind, the total of its interior angles and the total of its exterior angles
building basic geometric figures from supplied data, using ruler, compasses, set squares and protractors wherever appropriate