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# Represent (√9.3) on the number line.

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Represent (√9.3) on the number line.

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Step 1: Draw a 9.3 units long line segment, AB. Extend AB to C such that BC = 1 unit.

Step 2: Now, AC = 10.3 units. Let the centre of AC be O.

Step 3: Draw a semi-circle of radius OC with centre O.

Step 4: Draw a BD perpendicular to AC at point B intersecting the semicircle at D. Join OD.

Step 5: OBD, obtained, is a right angled triangle.

Here, OD 10.3/2 (radius of semi-circle), OC = 10.3/2 , BC = 1

OB = OC – BC

⟹ (10.3/2)-1 = 8.3/2

Using Pythagoras theorem,

We get,

OD2= BD2 + OB2

⟹ (10.3/2)2 = BD2+(8.3/2)2

⟹ BD2  =(10.3/2)2-(8.3/2)2

⟹ (BD)= (10.3/2)-(8.3/2)(10.3/2) + (8.3/2)

⟹ BD2 = 9.3

⟹ BD =  √9.3

Thus, the length of BD is √9.3.

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 √9.3 from O as shown in the figure.

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