1.

In the given figure, \[{{115}^{o}}\]\[{{95}^{o}}\] and \[\angle PAD={{30}^{o}}\]. If AO = 5.4 cm, OC = 7.2 cm and BO = 6 cm, then the length of DO is

A. 4.5cm              
B. 4cm
C. 5cm                
D. 6.5cm
Answer» B. 4cm


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