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NCERT Class 9 Solutions: Number Systems (Chapter 1) Exercise 1.5 β Part 2
Q-4 Represent on the number line.
Solution:
- Step 1: Draw a line segment of unit 9.3. Extend it to C so that BC is of 1 unit. Step 2: Now,
units. Find the centre of AC and name it as O.
Step 3: Draw a semi-circle with radius OC and centre O.
Step 4: Draw a perpendicular line BD to AC at point B which intersects the semicircle at D. Also, Join OD.
Step 5: Now, OBD is a right angled triangle.
Using Pythagoras theorem,
βΎ
βΎ
βΎ
βΎ
Thus, the length of BD is .
Step 6: Taking BD as radius and B as centre draw an arc which touches the line segment.
The point where it touches the line segment is at a distance of from O as shown in the figure.
Q-5 Rationalise the denominators of the following
Solution: