Angles facts
- 1. October 4, 2012 Angles 1. Angle facts Next
- 2. Explanation October 4, 2012 The sum of the angles on a straight line is always 180º. b 140º a 40º You can describe this rule using letters. 40 + 140 = 180 a b More Next
- 3. Explanation October 4, 2012 The sum of the angles round a point is always 360º. a 140º d 40º b 40º c 140º You can describe this rule using letters. 140 + 40 + 140 c + d = 360 a b + + 40 More Next
- 4. Explanation October 4, 2012 When two lines cross, the opposite angles are equal. a 140º c 40º d 40º b 140º You can describe this rule using letters. a=b c=d More Next
- 5. Explanation October 4, 2012 The sum of the angles inside a triangle is always 180º. b c a You can describe this rule using letters. a + b + c = 180 More Next
- 6. Revise October 4, 2012 These are the four types of triangle. Right-angle Isosceles Scalene Equilateral Equal sides can be shown using a small ‘dash’. More Next
- 7. Explanation October 4, 2012 The sum of the angles in a quadrilateral is always 360º. b 63º 69º a 124º d 104º c 69 + 63 + 104 + 124 = 360 a b c d More Next
- 8. Explanation October 4, 2012 The angles in this quadrilateral still add up to 360º, even though it is a re-entrant shape. You can see this if you think of it as two triangles. 180 + 180 = 360 More Next
- 9. Practise October 4, 2012 Find the missing angles. 144º 65º 85º c 88º 144º a 132º 46º b 78º More Next End