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How to …… Bisect an angle.. What? ‘Bisect’ means to cut exactly in half. If you bisect an angle, you get two equal angles e.g. if you bisect a 60° angle.

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Presentation on theme: "How to …… Bisect an angle.. What? ‘Bisect’ means to cut exactly in half. If you bisect an angle, you get two equal angles e.g. if you bisect a 60° angle."— Presentation transcript:

1 How to …… Bisect an angle.

2 What? ‘Bisect’ means to cut exactly in half. If you bisect an angle, you get two equal angles e.g. if you bisect a 60° angle you get two 30° angles. Any point on the angle bisector will be equidistant from the lines which make the original angle.

3 I was okay until the last bit. Angle bisector Equal lengths

4 How to bisect an angle

5 Set your compasses to a reasonable length

6 Place the point on the vertex of the angle And draw 2 arcs.

7 Like this….

8 Now place the compass point where one of the arcs cross the line And draw another arc ‘inside’ the angle

9 Should look similar to this

10 Now repeat on the other side

11 Draw a line from where the arcs cross to the vertex of the angle

12 You have bisected the angle Leave your arcs in situ


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