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Year 9 Interactive Maths - Second Edition


Bisector of an Angle

We adopt the following steps to bisect (cut in half) an angle ABC using a ruler and a compass.

Step 1


With B as the centre, draw an arc to cut the arms, BA and BC, of the angle at P and Q respectively.

Step 2

Using the same radius, draw an arc centred at P.

Step 3

Draw an arc using the same radius centred at Q to cut the arc drawn in Step 2.

Step 4

Join BR.


BR
bisects angle ABC, and is called the bisector of angle ABC.


Key Terms

bisector


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