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Lesson 9 of 20 · 3 moves

Angle Bisector

Cut the angle at V into two equal angles.

VAB
The finished construction: the figure in gold over the lines that found it.

Euclid I.9. A and B sit the same distance from V, so a rhombus built on them has V at one corner and its diagonal splits the angle evenly.

Complete this to earn the Angle tool.

Try it in Construct

The app snaps to every crossing, checks your construction exactly, and offers hints one move at a time.

Step by step

  1. VAB

    Circle centred on A through V.

  2. VAB

    Circle centred on B through V.

  3. VAB

    Line from V through the far crossing.

What it shows

The rhombus’s diagonal is its line of symmetry. You have earned the Angle tool.