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# Angle Rules

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A slide show showing the basic angle rules that should be known for KS3 Maths.

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• Superb! My darling children find this show absolutely fascinating! I most truly look forward to viewing other shows! Liliana P. Masters

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### Angle Rules

1. 1. FACT A <ul><li>Angles around a point add up to 360 º </li></ul>
2. 2. FACT B <ul><li>Angles on a straight line add up to 180 º </li></ul>
3. 3. FACT C <ul><li>Angles in a triangle add up to 180 º </li></ul>a b c a + b + c = 180º
4. 4. FACT D <ul><li>The base angles in an isosceles triangle are equal. </li></ul>
5. 5. FACT E <ul><li>Each angle in an equilateral triangle is 60 º </li></ul>60 º 60 º 60 º
6. 6. FACT F <ul><li>Vertically opposite angles are equal. </li></ul>a a b b
7. 7. FACT G <ul><li>Alternate angles are equal </li></ul>a a
8. 8. FACT G <ul><li>Corresponding Angles are equal </li></ul>b b
9. 9. FACT H <ul><li>Allied angles add up to 180 º. </li></ul>x y x + y = 180 º