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OA²  =  ( 4 - 0 )² + ( 0 - 0 )² =  16  

OA  = √ 16 = 4 cm

AB²  = ( 2 - 4 )² + ( 2 √3 - 0 )²  =  ( - 2 )² + ( 2 √3) ² ) 4 + 12 = 16

AB  = √ 16 = 4  cm

OB ²  = ( 2 - 0 )² + ( 2 √3 - 0 )² =  2 ² + ( 2 √3 )²  = 4 + 12 = 16

OB  =  √ 16 = 4 cm  

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