- Books Name
- CBSE Class 6 Mathematics Book
- Param Publication
- CBSE Class 6
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 .