I need help ion fully know what to do

For the first half; 2 is corresponding, 3 is alternate interior, 4 is alternate exterior, 5 is corresponding and 6 is alternate interior. As for the second half; 7 is 55 degrees, 8 is 145 degrees, 9 is 35 degrees, and 10 is 55 degrees.

Ok

relation of diameter to radius
2 radius=1diameter
radius=1/2 diameter
2r=d
d/2=r

circumfernce=2pir
since 2r=d
circumference=2d

so
c=pid=2pir

so if ou have circunference and you want to find diameter and radius
c=pid
divde both sides by pi
c/pi=d

c=2pir
divide both sides by 2pi
c/(2pi)=r

so
r=c/(2pi)
d=c/pi