Answer:
the answer is r= 1/2(121)
Step-by-step explanation:
the radius is half of the diameter
I always started by written out the multiples and stopped when the numbers lined up. For example:
5:5,10,15,20,25,30,35,40,45,50,55,60
12:12,24,36,48,60
The lcm of 5 and 12 is 60. Another tip is to multiply the two numbers together so 5x12 is 60 and check to see if there is a smaller number
5*4/4 +1/4
20/4+1/4
21/4
You can multiply the whole number by 1, for the same number...but in the terms you need...for example, 5/5=1, but by multiplying by that, you'll get the number /5