The radius of circle is 41.76 cm
<u><em>Solution:</em></u>
Given that, 70° arc of a circle has a length of 51 cm
To find: Radius of circle
<em><u>The formula for arc length when angle given in degrees is:</u></em>
Where,
"r" is the radius of circle and is the central angle in radians
From given,
Arc length = 51 cm
= 70 degrees
<em><u>Substituting the values in formula,</u></em>
Thus the radius of circle is 41.76 cm