Using B as center, use the circle tool to draw an arc of any radius.

Construct a point where that circle intersects ray BA and label the point as X. Construct another point where the circle intersects ray BC and label that point as Y.

Using X as center and a radius that is a little more than halfway from X to Y, draw a circle.

Use the segment tool to draw a radius of the circle you just constructed in Step 3.

Use the Compass tool and select the segment you just constructed in Step 4 and point Y to construct a circle centered at Y with the same radius as the circle you constructed in Step 4.

Construct point Z where the circles constructed in Steps 3 and 5 intersect.