Perpendicular Lines

POINT

Use equal-radius arcs to construct a 90° line.

Example

① Construct a perpendicular to line ℓ through point P on the line.

② Construct a perpendicular to line ℓ through point P outside the line.

①

②

Practice

Try this construction yourself.

① Construct a perpendicular to line ℓ through point A on the line.

② Construct a perpendicular to line ℓ through point B outside the line.

Please refer to the video above for the construction. If you have any questions, ask in the video comments.