Homework Help: Math rem

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

2.Find the length of the arc in a circle if the radius of the circle is 24cm and the degree of the arc is 90o

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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