Page 334 - Math_Genius_V1.0_C7_Flipbook

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1. Draw the angles of the following measures using a protractor.
(a) 45° (b) 72° (c) 90° (d) 115° (e) 198°
2. Construct a half circle of radius 4 cm. Using the same half circle, can you draw a portion of
the arc bridge as shown below? If yes, then draw.

3. Construct a rectangle where one of its sides is 4 cm and the length of a diagonal is 7 cm.
4. With the same centre O, draw two circles of radii 3.8 cm and 4.6 cm.
5. Recreate the image of a person given below with a ruler and a compass.

Construction of Line Segment

We know that a line segment has two end points. So, a line segment has a fixed length.
If we know the length of a line segment, we can draw it using a ruler.
But it is always better to have compass along with the ruler. A 4.5 cm B
Let us draw a line segment of length 4.5 cm using a ruler and a compass.
Steps of construction:
1. Draw a line l. Mark a point A on line l. A l
2. Place the pointer of the compass on the zero-mark of the ruler.
3. Open the compass in such a way that the pencil point of the compass corresponds to mark
4.5 cm on the ruler.

4. Without changing the opening of the compass, place the pointer on A and cut an arc on l
at B.

l
A 4.5 cm B

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