Lines and angles

What you need to learn in this topic

1. Determine and explain the congruency of line segments and angles.
2. Estimate and measure the size of line segments and angles, and explain how the estimation is obtained.
3. Recognise, compare and explain the properties of angles on a straight line, reflex angles, and one whole turn angles.
4. Describe the properties of complementary angles, supplementary angles and conjugate angles.
5. Solve problems involving complementary angles, supplementary angles and conjugate angles.
6. Construct (i) line segments, (ii) perpendicular bisectors of line segments, (iii) perpendicular line to a straight line, (iv) parallel lines and explain the rationale of construction steps.
7. Construct angles and angle bisectors, and explain the rationale of construction steps.