If the radius of the circle is increased 3 times :

If the radius of the circle is increased 3 times. Then hoe many times the new circumference increase from its original size ?
(a) 3
(b) 1/3
(c) 9
(d) None of these

Anurag Mishra Professor Asked on 10th February 2016 in Maths.
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1 Answer(s)

Answer: (a) 3

Solution:-
Let the radius of a triangle be R cm

Then, the circumference of a circle = 2 pR

If the radius of the circle is increased by 3 time.
Then, radius = 3 R

Now, new circumference of a circle = 2 x p x 3 R
= 6 pR

New circumference of a circle  = 3 x 2pR (circumference of original circle)

So, the circumference of new circle will be 3 times from its original size.

Hence, the correct answer is option (a) 3.

Anurag Mishra Professor Answered on 10th February 2016.
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