- Books Name
- CBSE Class 6 Mathematics Book

- Publication
- Param Publication

- Course
- CBSE Class 6

- Subject
- Mathmatics

**Angles**

Constructing an angle of a given measure

Suppose we want an angle of measure 40°.

Here are the steps to follow :

**Step 1 ** Draw AB of any length.

**Step 2** Place the centre of the protractor at A and the zero edge along AB.

**Step 3** Start with zero near B. Mark point C at 40°.

**Step 4** Join AC. *∠*BAC is the required angle.

**Bisector of an angle**

Construction with ruler and compasses

Let an angle, say, *∠*A be given.

**Step 1 ** With A as centre and using compasses, draw an arc that cuts both rays of *∠*A . Label the points of intersection as B and C.

**Step 2 ** With B as centre, draw (in the interior of *∠*A ) an arc whose radius is more than half the length BC.

**Step 3** With the same radius and with C as centre, draw another arc in the interior of *∠*A. Let the two arcs intersect at D. Then AD is the required bisector of*∠*A .