Question

Guys I need this questions answer​

Answer 1

Answer:

1/30 cm

Step-by-step explanation:

PI*R^2*H=PI*r^2*h

PI cancelled

1/2*1/2*8=r^2*1800

{1800 came from changing 18 cm to m}

2/1800=r^2

1/900=r^2

1/30=r