SOLUTION: the area of a circle is increased by 45 pi square centimetres if the diameter is increased by 6 cm. what was the original circumference of the circle?

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Question 947550: the area of a circle is increased by 45 pi square centimetres if the diameter is increased by 6 cm. what was the original circumference of the circle?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39617)   (Show Source): You can put this solution on YOUR website!
Original circumference, .

Increased radius, ;

Increaese of area,





, the original radius.

The original circumference was or .
Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!
the area of a circle is increased by 45 pi square centimetres if the diameter is increased by 6 cm. what was the original circumference of the circle?
Original circumference: 

You can do the check!! 

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