The diagram shows a triangle ABC. On the diagram,

  1. (a)

    construct the bisector of angle ABC,

  2. (b)

    construct the perpendicular bisector of BC,

  3. (c)

    label the point P that is equidistant from B and C, and also equidistant from AB and BC.

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Worked solution

11(a)

1. Construct equal arcs from the vertex of the angle.

Place the compass point at BB. Draw an arc cutting BABA and BCBC at two points.

2. Locate a point inside the angle equidistant from the two arms.

Without changing the compass width, place the compass point on each of the two arc-intersection points and draw two arcs inside ∠ABC\angle ABC so that the arcs intersect.

3. Draw the angle bisector.

Use a ruler to draw a straight line from BB through the intersection of the two arcs. This line is the bisector of ∠ABC\angle ABC.

Answer

The angle bisector of ∠ABC\angle ABC is drawn from BB to the opposite side ACAC.

11(b)

1. Construct equal arcs from $B$ and $C$ to locate two points equidistant from both endpoints.

Set the compass to a radius greater than half of BCBC. With centre BB, draw arcs above and below BCBC. Without changing the compass width, with centre CC, draw arcs above and below BCBC so that they intersect the first arcs.

2. Draw the perpendicular bisector through the two arc-intersection points.

Use a ruler to join the two arc-intersection points. This line is the perpendicular bisector of BCBC.

Answer

The perpendicular bisector of BCBC is drawn: a straight line crossing BCBC at its midpoint at 90∘90^\circ.

11(c)

1. Identify and label the common point satisfying both equidistance conditions.

Since PP is equidistant from BB and CC, it lies on the perpendicular bisector of BCBC.
Since PP is equidistant from ABAB and BCBC, it lies on the angle bisector of ∠ABC\angle ABC.
Therefore, label PP at the intersection of these two constructed lines.

Answer

PP is labelled at the intersection of the angle bisector of ∠ABC\angle ABC and the perpendicular bisector of BCBC.

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