Lesson 3 of 20 · 3 moves
Perpendicular Bisector
Draw the line that cuts AB in half at a right angle.
Both crossings of the vesica are the same distance from A as from B. So is every point on the line through them, which is why it meets AB square and in the middle.
Complete this and you earn the Bisect tool, which does it in a single move.
The app snaps to every crossing, checks your construction exactly, and offers hints one move at a time.
Step by step
Circle centred on A through B.
Circle centred on B through A.
Line through the two crossings.
What it shows
The vesica’s axis: the line of balance between two centres. You have earned the Bisect tool.