Question

The radii of two circles are \(19cm\) & \(9cm\) respectively. Find the radius of the circle which has circumference equal to the sum of the circumferences of two circles.

Answer 1

@ash2326 help plz :)

Answer 2

@experimentX plz help :)

Answer 3

hmm ... begin with Let the radius of circle be r, then circumference is ??

Answer 4

2\(\pi\)r

Answer 5

?

Answer 6

yes ... and find the circumference of those two circles.

Answer 7

Bigger = 2\(\pi r\) = 2*22/7*19 = 836.
Smaller = 2\(\pi r\) = 2*22/7*9 = 396.

Answer 8

yes ... now let's add it up.
2 pi r = 2 pi r1 + 2 pi r2 <-- if you hadn't changed ... it would have been better.

Answer 9

oh but i had done a mistake Bigger = 836/7
Smaller = 396/7

Answer 10

no .. don't change pi into 22/7 ... just keep it symbolic.

Answer 11

oh k

Answer 12

38\(\pi\)+18\(\pi\) = 56\(\pi\)

Answer 13

yes ...
euquate it to, 2pi r = 56 pi

Answer 14

r=56/2=28

Answer 15

now wht ?

Answer 16

hmm .. it seems you are right.
\[ r = r_1 + r_2 \]

Answer 17

Oh i got my answer Thanx Bhaiya :D

Answer 18

hmm ... you are welcome :D

Answer 19

going to ask another one :)