Verified answer

(1/3)*π*x^2*10 = 30*π

=> x^2=9

=> x=+/- 3

X=3

1/3*pi*(3)^2*(10)

= 1/3*pi*(9)*(10)

= 1/3*pi*(90)

= 90/3*pi

=30pi

(1/3)πx²(10)=30π

( 1/3)x²(10)=30

x²=9

x= ±√9

x=±3

1/3*pi.x^2=30pi

pix^2=90pi

divide both side by pi

pix^2/pi=90pi/pi

x^2=90

x=sqrt 90

x=3sqrt10

x=3.3.16

x=9.48 approximately