What is the exact circumference of the circle?

a. 16
cm

b. 8
cm

c. 4
cm

d. 2
cm

i need the answer quickly !

Which property is illustrated by the following statement? if hxa rgi, then rgi hxa.

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

Ethan is proving that the slope between any two points on a straight line is the same. he has already proved that triangles 1 and 2 are similar. drag statements and reasons to complete the proof.