In a Delta ABC, if a:b:c=4:5:6, then the...

In a `Delta ABC,` if `a:b:c=4:5:6,` then the ratio of the radius of its circumcircle to that of its incircle

A

`16:7`

B

`12:7`

C

`15:8`

D

`16:9`

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A

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