Angles and Straight Lines

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 […]

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Bisecting a Line

To bisect a line AB, or cut it in half, we need to draw a line through the middle of the line AB, perpendicular to AB. We use a compass. Put the needle at A, open the compass to more that half the distance of the line AB and draw an arc through the line. […]

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The Sine Rule

We can use the sine rule to 1.Find a side when it is opposite and a known angle and we also have another side opposite another angle, both of which we know: 2. Find an angle when it is opposite an known side and we also have another side opposite another angle, both of which […]

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