Step-by-step explanation:
the formula to calculate a circumference is

(consider x as the diameter)
so I'll be noting the circumference as C alongside the circle's ranking
a.

b.

c.

hope I helped
Answer:
110
Step-by-step explanation:
bc it is a right angle it has to ad up to 180
Answer: The correct answer is (B)
Step-by-step explanation: No. Ari should have written the percent ratio as 5/100
Answer:
The solution will be negative.
Step-by-step explanation:
I'm not quite sure what sort of answer you're looking for though.