if area of sector of a circle is 105 cm2 and length of its arc is 30 cm, calculate the radius of the circle. 

Hi!
Here is the answer to your question.
 
Let the central angle made by the sector of the circle be Θ and the radius of the circle be r.
It is given that, area of the sector of the circle = 105 cm2
Thus, the radius of the circle is 7 cm.
 
Best wishes!

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