Question 1142405
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In this problem, the units for measures of "r" and "s" must be consistent: centimeter and centimeter;  or inch and inch, and so on.


Then you obtain your angle in <U>radians</U>.


Your answer is correct:  {{{10/8}}} = 1.25 radians.
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;remember :  &nbsp;&nbsp;&nbsp;&nbsp;RADIANS  (!)