The radian angle shown in the diagram should be considered as the 0.65.
Since radius is 10 inches
And, An arc is traced from point A to point B with a length of 6.5 inches.
So here the radian angle be like
[tex]= 6.5 / 10[/tex]
= 0.65.
Hence, The radian angle shown in the diagram should be considered as the 0.65.
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