represent √4.5 on no. line
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1 draw a line ab 4.5 cm
2 draw a line bc 1 cm then draw a perpendicular bisector of ac Mark it as O
AO as radius draw a semi circle so ao=of draw a perpendicular line from b which intersects the semi circle and Mark it as d then extend the line from c and draw an arc which intersects on the extended line and Mark it as p
So bp is root of 4.5
2 draw a line bc 1 cm then draw a perpendicular bisector of ac Mark it as O
AO as radius draw a semi circle so ao=of draw a perpendicular line from b which intersects the semi circle and Mark it as d then extend the line from c and draw an arc which intersects on the extended line and Mark it as p
So bp is root of 4.5
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