Answer:
4.5cm
Step-by-step explanation:
Circumference = 2r
28.3=2r
28.3/2=r
4.456
X=22.5
Y=kX
20=15k
k=4/3
For X when Y=30
30=4/3×X
Cross multiply
4X=90
Um.. Is this a question ?
idk
sorry man i can't help u rite now but i can get u a tooter tho