Angles & Parallel Lines
This topic looks at the angles formed when a transversal cuts parallel lines, including alternate, corresponding, vertically opposite, and interior angles. These are basic but important concepts that many students may already be familiar with.
Related Lessons:
Names Of Different Angle Sizes
In this video, we are going to cover the names of different angle sizes:
- Acute angles are between 0 and 90 degrees
- Obtuse angles are between 90 to 180 degrees
- Reflex angles are between 180 to 360 degrees
Angles Properties Of Parallel Lines
Next, we will study angle properties formed between parallel lines. To make these properties easier to recognise, we will relate each type of angle to a simple alphabet pattern:
- Alternate angles form a “Z” shape.
- Corresponding angles form an “F” shape.
- Interior angles form a “U” shape.
Complementary & Supplementary Angles
Next, we will learn about complementary and supplementary angles.
- Complementary angles are angles that add up to 90°.
- Supplementary angles are angles that add up to 180°, which is the same as angles on a straight line.
Angle Properties For 360 Degree
Lastly, we will learn about angles at a point.
- Vertically opposite angles is when two angles form an “X” shape and are always equal.
- Angles at a point is where the sum of all angles around a point is 360°.