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KS3 Mathematics

KS3 Mathematics. S1 Labelling Lines and Angles. Lines. In Mathematics, a straight line is defined as having infinite length and no width. Is this possible in real life?. Labelling line segments. A. B. When a line has end points we say that it has finite length . .

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KS3 Mathematics

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  1. KS3 Mathematics S1 Labelling Lines and Angles

  2. Lines In Mathematics, a straight line is defined as having infinite length and no width. Is this possible in real life?

  3. Labelling line segments A B When a line has end points we say that it has finite length. It is called a line segment. We usually label the end points with capital letters. For example, this line segment has end points A and B. We can call this line ‘line segment AB’.

  4. Labelling angles or ABC or B. The angle can then be described as ABC When two lines meet at a point an angle is formed. A B C An angle is a measure of the rotation of one of the line segments relative to the other. We label points using capital letters. Sometimes instead an angle is labelled with a lower case letter.

  5. Conventions, definitions and derived properties A convention is an agreed way of describing a situation. For example, we use dashes on lines to show that they are the same length. A definition is a minimum set of conditions needed to describe something. 60° For example, an equilateral triangle has three equal sides and three equal angles. 60° 60° A derived property follows from a definition. For example, the angles in an equilateral triangle are each 60°.

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