## PROBLEMS ON VOLUME

To find volume of the shapes, we will be using the formulas given below.

Volume of sphere  =   (4/3) π r3

Volume of hemisphere  =   (2/3) π r3

Volume of cone  =   (1/3) π r2h

Volume of cylinder  =   π r2h

Problem 1 :

A steel bar is 2.2 m long and has a diameter of 5 cm. Find the volume of the bar in cm3.

Solution :

Length of steel bar  =  2.2 m  (or)  220 cm

Radius  =  5/2  ==>  2.5 cm

Volume of steel bar  =  π r2h

=  (3.14) (2.5)2(220)

=  4317.5 cm3

Problem 2 :

A stainless steel wine vat is cylindrical with base diameter 1.8 m and height 6 m. How much wine does it hold if it is 90% full?

Solution :

Radius  =  1.8 m, height  =  6 m

Volume of steel bar  =  90% of π r2h

=  0.90 x 3.14 x (1.8)2 x 6

=  54.93 m3

Problem 3 :

A box has a square base and its height is 12 cm. If the volume of the box is 867 cm3, find its length.

Solution :

Let base length of the square as x.

Volume of box  =  867 cm3

Area of square base x height  =  867

x2 x 12  =  867

x2  =  867/12

x2  =  72.25

x  =  8.5 cm

Problem 4 :

15.4 mm of a rain falls on a rectangular shed roof of length 12 m and width 5.5 m. All of the water goes into a cylindrical tank of base diameter 4.35 m. By how much does the water level in the tank rise in mm ?

Solution :

Measures of rectangular shed :

Length  =  12 m  =  12000 mm

width  =  5.5 m  =  5500  mm

height  =  15.4 mm

Radius  =  4.35/2  =  2.175 m

=  2175 mm

Volume of water in rectangular tank  =  Volume of water in cylindrical tank

length x width x height  =  π r2h

12000 x 5500 x 15.4  =  3.14 x (2.175)2 x h

h  =  (12000 x 5500 x 15.4)/3.14 x (2175)2

h  =  68.42 mm

Problem 5 :

Find the volume of the figure shown below.

Solution :

Volume  =  Base area x height

Base area  =  Area of large circle - Area of small circle

Let R and r be radius of large and small circles respectively.

R  =  0.8/2, r  =  0.4/2

R  =  0.4 m and r  =  0.2 m

Area of base  =  πR2 -  πr2

=   π(0.42 - 0.22)

=  3.14(0.12)

Area of base  =  0.3768 m2

Height  =  1.2 m

Volume  =  0.3768 x 1.2

=  0.45216 m3

Problem 6 :

Find the volume of the figure given below.

Solution :

Volume of cylinder  =  πr2h

radius  =  6 cm and height  =  10 cm

=  π(6)2 (10)

=  3.14(36)(10)

Volume of cylinder  =  1130.4 cm3

Problem 7 :

Tom has just had a load of sand delivered. A pile of sand is in the shape of a cone of radius 1.6 m and height 1.2 m. Find the volume of sand Tom has had delivered.

Solution :

Volume of sand to be delivered  =  (1/3) πr2h

radius  =  1.6 m and height  =  1.2 m

=  (1/3) π(1.6)2(1.2)

=  (1/3)x3.14x(1.6)2(1.2)

=  3.19 m3

Volume of sand delivered is 3.19 m3.

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