The legnth is irrelivant
we know that
Circumference=2 times pi time radius
c=40
40=2 times pi times radius
divide both sides by 2
20=pi times radius
divide both sides b pi
20/pi=radius
the radius is 20/pi cm or aproximately 6.366199048 cm
I’m not sure what you want to find but if it’s for the answer for a in it’s exact form your answer will be 163/35 Hope this helps!
Answer:
y=7
Step-by-step explanation:
