Angles and Straight Lines

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Opposite angles are equal

Alternate angles when a line is drawn to intersect parallel lines are equal. To recognise when this rule can be used look for ‘Z’ shapes.

Supplementary or complementary angles when a line is drawn to intersect parallel lines add to 180 Degrees, soAgain look for ‘Z’ shapes. The supplementary angles are on the same side of the ‘Z’.

Corresponding angles can be ‘slid’ along a line between parallel lines. Corresponding angles are equal.

Angles on a straight line add up to 180 Degrees.

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