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October 20, 2014

October 20, 2014

Posted by **bs** on Monday, February 11, 2013 at 10:53am.

3.Find the length of the arc if a circle if the degree if the arc is 120o and the length of the radius is 8cm.

4. A circle has a radius of 7. Find the diameter (D) and the (A).

5. Find the circumferemce of a circle if the area is 9/25pift^2.

- Math rem -
**Reiny**, Monday, February 11, 2013 at 11:32am#1 and #2 are the same type of problem

I will do #2

whole circumference = 2π(8) = 16π

but 120° is 1/3 of the circle, thus the arc is 1/3 the circumference

= (1/3)(16π) = 16π/3 cm or appr 16.755 cm

#4 ??? come on now!!!

#5 area = πr^2

πr^2 = (9/25)π

r^2 = 9/25

r = 3/5

circumf = 2πr = 2π(3/5) = 6π/5 ft or appr. .....

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