Page 105 - Revised Maths Wisdom Class - 6

Lines and Angles 103

INTEGRATED QUESTION (SOCIAL SCIENCE/MATHS)

The map shows the area and roads around a school.

Use this map to answer the following questions: Road-1
(a) Colour all roads that are parallel to Abu lane with black colour. Road- 4

(b) Mark 3-obtuse angles with level O , O , O . Road-5 Road-3
1 2 3 School
(c) Find the name of that road which is perpendicular to road-2. Road-2

(d) How many right angles are in this map.
Abu Lane
(e) Mark 6-acute angles with level a, b, c, d, e, f.

VOCABULARY
VOCABULARY
Magnitude Parallel Perpendicular Close Figure Interior Exterior
Sector Concentric Minor Major Circular Altitude

ACTIVITY TIMEACTIVITY TIME

Making a Protractor
1. Cut out a circular shape using a bangle or take a circular sheet of
about the same size.

2. Fold it twice to get a shape as shown. This is called a quadrant.

3. Open it out. You will find a semi-circle with a fold in the middle.
Mark 90° on the fold.

4. Fold the semicircle to reach the quadrant. Now fold the quadrant
once more as shown. The angle is half of 90° i.e. 45°.

5. Open it out now. Two folds appear on each side. What is the angle
upto the first new line? Write 45° on the first fold to the left of the
base line.

6. The fold on the other side would be 90° + 45° = 135°

7. Fold the paper again upto 45° (half of the quadrant). Now make
half of this. The first fold to the left of the base line now is half of
45° i.e. 22½°. The angle on the left of 135° would be 157½°.

You have got a ready device to measure angles. This is an approximate protractor.