Ex 14.6, 8 Draw an angle of 70 °. Make a copy of it using only a straight edge and compasses.
Here, we will draw 70° using protractor.
We follow these steps
Draw a ray OA
2. Place center of protractor on point O,
and coincide line OA and Protractor line
Mark point B on 70°
Join OB
∴ ∠ AOB = 70°
Now, we need to make its copy
Let’s follow these steps
Draw a ray OP
2. From point O, draw an arc of any radius
intersecting the sides at D & E
3. Using compass opened the same length,
draw an arc with point O as the center,
cutting OP at Q
4. Now, back to our angle ∠ BOA.
Open compass to length DE
5. Keeping the same radius,
Put pointed end of compass on point Q, and draw an arc.
The point where it cuts previous arc is point R.
6. Join OR
Thus, ∠ ROQ is the copy of ∠ BOA = 70°

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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