SOLUTION: Two wire circles of diamerets 12 cm and 8 cm are cut and then joined to make one larger circle. Find the diameter of large circle. plz help me .Thanks in advance.

Algebra ->  Circles -> SOLUTION: Two wire circles of diamerets 12 cm and 8 cm are cut and then joined to make one larger circle. Find the diameter of large circle. plz help me .Thanks in advance.      Log On


   

Question 919948: Two wire circles of diamerets 12 cm and 8 cm are cut and then joined to make one larger circle. Find the diameter of large circle. plz help me .Thanks in advance.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Find the sum of the circumferences.
2%2Api%2A%2812%2F2%29%2B2%2Api%288%2F2%29
20pi
That is the circumference of the large circle from the two smaller circles.

Diameter:
2pi%2AR=20pi where R is the RADIUS.
R=10
that means, we want twice R because that would be the diameter.
highlight_green%282%2AR=highlight%2820%29%29