# Construction- parallel lines

## Constructing the parallel to (CB) passing through A.

1. Using the set square, draw the straight line passing through A and perpendicular to (CB)
at H.
2. Using the set square, draw the straight line (DE) passing through A and perpendicular to (AH).
The two straight lines (CB) and (AH), being perpendicular to the same straight line (AH), are parallel.
(DE) is then the required straight line.

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