How to make 120 degree with …

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How to make 120 degree with compass

Posted by Sam Shaikh 7 years, 10 months ago

CBSE > Class 06 > Maths (OLD)

2 answers

Vrinda Sharma 7 years, 10 months ago

Firstly make the angle of 60 degree then keep your compass point at 60 degree and draw an Arc on the semicircle that you have made and this will be your 120 degree angle and please check the major of that angle

0Thank You

Kritika Trehan 7 years, 10 months ago

1). Use Ruler and draw a Line segment BC of any convenient length. (as shown below)

<a href="http://images.algebraden.com/geometry/big/construct-120-degree-angle-with-compass.jpg" target="_blank"></a>

2). Now use compass and open it to any convenient radius. And with B as center , draw an arc which cuts line segment BC at Q . (as shown below)

<a href="http://images.algebraden.com/geometry/big/construct-120-degree-angle-with-compass-2.jpg" target="_blank"></a>

3). Again use compass and opened to the same radius (as of step 2). And with Q as center , draw an arc which cuts first arc at R . (as shown below)

<a href="http://images.algebraden.com/geometry/big/construct-120-degree-angle-with-compass-3.jpg" target="_blank"></a>

4). Again use compass and opened to the same radius (as of step 2). And with R as center , draw another arc which cuts first arc at P . (as shown below)

<a href="http://images.algebraden.com/geometry/big/construct-120-degree-angle-with-compass-4.jpg" target="_blank"></a>

5). Join BP and extent it to A . (as shown below)

<a href="http://images.algebraden.com/geometry/big/construct-120-degree-angle-with-compass-5.jpg" target="_blank"></a>

6) Above formed angle ABC = 120 Degree