Construction of perpendicular lines by using a protractor is discussed here.

To construct a perpendicular to a given line *l* at a given point *A* on it, we need to follow the given procedure for constructing an angle of 90° at *A*.

**1.** Let *l* be the given line and *A* the given point on it.

**2.** Place the protractor on the line *l* such that its base line coincides with *l*, and its centre falls on *A*.

**3.** Mark a point *B* against the 90° mark on the protractor.

**4.** Remove the protractor and draw a line *m* passing through *A* and *B*.

Then line *m* ┴ line *l* at *A*.

These are the steps to construct a perpendicular.

**Construction of Perpendicular Lines by using a Protractor.**

**Sum of Angles of a Quadrilateral.**

**Practice Test on Quadrilaterals.**

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