Hinglish

Drawing Angles

Class 6 Maths · Chapter 2: Lines and Angles · NCERT Ganita Prakash section 2.10

Learn

Aditya wants to draw ∠MOR = 30°. O will be the vertex and OR the base arm. Step 1: draw the base OR with a ruler.

Step 2: place the centre of the protractor on O, and line up OR with the 0 line.

Step 3: starting from 0, count up to 30 on the same row of numbers, and mark point M there.

Step 4: join O and M with a ruler. ∠MOR = 30° is ready.

Your turn: draw an angle of 75° with the protractor.

Angle guessing game: guess an angle first, then measure it. Use what you know: 90° is an L, 45° is half an L, 135° is an L and a half.

Remember

  • Draw the base arm, put the protractor's centre on the vertex with the base on 0, count to the angle and mark a point, then join.
  • To estimate, compare with 90° (an L) and 45° (half an L).

Quick check

When you draw an angle with a protractor, where do you put the centre of the protractor?

  1. On the vertex
  2. At the far end of the base arm
  3. Anywhere on the arm
  4. On point T
Answer

On the vertex. The centre always goes on the vertex, with the base arm along 0.

Think about it

Without a protractor, try to draw 34°. How can you get close?

One answer

34° is a little more than one third of a right angle (30°). Draw half an L (45°), then make it a bit smaller.

Practice

Practise with fresh questions at three levels (easy, medium, hard), some answered hands-on, with hints and worked answers. Get 4 of your last 5 right to finish the topic.