I’m having a lot of trouble on this and could use help because i was absent when we learned this? Please help!!!

Answer:
Answers given in explanation
Step-by-step explanation:
Answers for question 3
Our first given value is just Pi by itself
C=Pi*d
Since Pi was a ungiven value, we just use it normally: π
C = π * 4.5
= 4.5π
= 4.5πcm
cm since you are adding in the unit.
Next for radius of 6
C = π * 2r
= π * 12
= 12π
= 12πin
Also continuing the unit.
Next is Pi on a calculator, which I don’t have.
We are given 3.14 for a π value
d = 4.5 cm
C = π * d
= 3.14 * 4.5
= 14.13cm (Continuing unit as always)
————————
Given radius = 6
C = π * 2r
= 3.14 * 2(6)
= 37.68in.
____________
Next given value for Pi = 22/7
C = π * d
= 22/7 * 4 1/2
= 14.1429cm
———
C = π * 2r
= 22/7 * 2(6)
= 37.7143in.