A) 17.2cm
B) 12.7cm
C) 12.5cm
D) 15.2cm
Correct Answer: C
Solution :
OA = OC = circum-radius \[\angle B\text{ }=90{}^\circ \] \[\therefore \text{ }A{{C}^{2}}=A{{B}^{2}}+B{{C}^{2}}={{15}^{2}}+{{20}^{2}}\] \[=225+400=625\] \[\therefore \]\[AC=\sqrt{625}=25\] cm \[\therefore \]\[OA=25\div 2=12.5\]cmYou need to login to perform this action.
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