The DAV Maths Book Class 4 Solutions and **DAV Class 4 Maths Chapter 10 Worksheet 3 **Solutions of Angles offer comprehensive answers to textbook questions.

## DAV Class 4 Maths Ch 10 WS 3 Solutions

Question 1.

Use the protractor and measure the following angles.

Answer:

45°

Answer:

70°

Answer:

110°

Answer:

35°

Answer:

90°

Answer:

115°

Answer:

120°

Answer:

180°

Question 2.

Construct angles of the following measures. Label the angles and name them.

(a) 40°

Answer:

∠PQR = 40°

(b) 75°

Answer:

∠ABC = 75°

(c) 90°

Answer:

∠XYZ = 90°

(d) 100°

Answer:

∠LMN = 100°

(e) 120°

Answer:

∠DEF = 120°

(f) 155°

Answer:

∠STR = 155°

### DAV Class 4 Maths Chapter 10 Worksheet 3 Notes

Measuring Angles:

The standard unit of an angle is Degree. The symbol (°) is used for degree. We use protractor to measure an angle.

There are two rows of numbers marked on the protractor. Numbers are marked from 0 to 180. It has two scales in reverse order. Measuring ZABC

- Step I: Place the centre of the protractor on the vertex B of ∠CBA. Adjust the arm BA.
- Step II: Look for the scale which begins with zero.
- Step III: Read the mark on the protractor where the other arm (\(\overrightarrow{\mathrm{BC}}\)) of the angle crosses the scale on the protractor.

∠ABC = 80° as shown in figure. Angles opening to left increases from left to right. Angles opening to right increases from right to left.