Question

HELP ME Pleasesssss??I need this ASAP please helpp me with this 3 Questions :)

1)A cylindrical container of radius 4cm and height 15cm is half filled with water.Find the volume of water in the container .Give the answer correct to 3 significant figures.

2)A can is a cylinder of radius 3.4cm . It is completely filled with 233cm³ of orange juice. Find the height of the can.Give the answer correct to 3 significant figures.

3)A lampshade is in the form of cylinder of radius 11cm .It is open at both ends.The total surface area of lampshade is 1200cm² . Find its height .Give your answer correct to 3 significant figures.

Answer 1

753.6 cm³

21.825 cm

34.742 cm

Explanation:

1) V=πr²h

r= 4 cm, h= 15 cm

V= 3.14*4²*15= 753.6 cm³

2) V=πr²h

r= 3.4 cm, V= 233 cm³, h=?

h= V/πr²= 233/(3.14*3.4)= 21.825 cm

3) A=2πrh (not including base surface as it is open ended)

r= 11 cm, A= 1200 cm², h=?

h= A/(2πr)= 1200/(3.14*11)= 34.742 cm