Chapter 2: Angle relationships(Part 1)

Saumil S. Sharma

B.Sc., MBA

NSW Syllabus for the Australian CurriculumCambridge MATHS for Year 7

Points, Lines, Intervals and Angles

• The fundamental building blocks of geometry are the point, line and plane.

• They are the basic objects used to construct angles, triangles and other more complex shapes and objects.

• Points and lines do not actually occupy any area but can be represented on a page using drawing equipment.

Points, Lines, Intervals and Angles

Points, Lines, Intervals and Angles

Points, Lines, Intervals and Angles

Points, Lines, Intervals and Angles

Measuring and classifying angles

• Angles are usually described using the unit of measurement called the degree, where 360 degrees (360°) describes one full turn.

• The idea to divide a circle into 360° dates back to the Babylonians, who used a sexagesimal number system based on the number 60. Because both 60 and 360 are numbers that have a large number of factors, many fractions of these numbers are very easy to calculate.

Measuring and classifying angles

Measuring and classifying angles

Measuring and classifying angles

Measuring and classifying angles

Measuring and classifying angles