# FIND THE VOLUME OF EACH FIGURE

What is volume ?

Volume is the number of three-dimensional spaces an object occupies.

It is measured in cubic units such as cubic meters, cubic centimeters, etc.

What is the volume of prisms ?

A prism is solid with a uniform cross-section. This means that no matter where it is sliced along its length, the cross-section is the same size and shape.

To find the volume for any solid of uniform cross-section

Volume  =  area of cross-section × length

Find the volume of the following :

Problem 1 :

Solution :

By observing the figure, it is a rectangular prism.

Here area of cross-section is the shape of the rectangle.

To find the volume,

Volume = length × width × height

we have,

length = 11 m, width = 7 m and height = 5 m

Volume = 11 × 7 × 5

Volume = 385 m3

Problem 2 :

Solution :

By observing the figure, it is a cylinder.

Here area of cross-section is the shape of the circle.

To find the volume,

Volume  =  area of cross-section × length

Volume  =  area of the circle × length

Volume  =  (πr2× h

we have,

diameter  =  6 cm,

radius (r)  =  6/2  =  3 cm and height (h)  =  12 cm

π(3)× 12

= (3.14 × 9 × 12)

Volume = 339 cm3

Problem 3 :

Solution :

By observing the figure, it is a triangular prism.

Here area of cross-section is the shape of the triangle.

To find the volume,

Volume  =  area of cross-section × length

Volume  =  area of the triangle × length

=  (1/2 × b ×  h) × l

we have,

base (b)  =  8 cm, height (h) = 5 cm and length (l) = 16 cm

=  1/2 × 8 × 5 × 16

Volume = 320 cm3

Problem 4 :

Solution :

By observing the figure, it is a irregular prism.

Here area of cross-section is the irregular shape.

To find the volume,

Volume  =  area of cross-section × length

we have,

area = 15 cm2, and length = 3 cm

Volume  =  15 × 3

Volume = 45 cm3

Problem 5 :

Solution :

By observing the figure, it is a trapezium prism.

Here area of cross-section is the shape of the trapezium.

To find the volume,

Volume  =  area of cross-section × length

Volume  =  area of the trapezium × length

=  1/2 × h × (b1 + b2× length

we have,

base (b1) = 12 cm, base (b2) = 10 cm, height (h) = 8 cm and length  =  8 cm

=  1/2 × 8 × (12 + 10) × 8

= 88 × 8

Volume = 704 cm3

Problem 6 :

Solution :

By observing the figure, it is a irregular prism.

Here area of cross-section is the shape of the rectangle and square.

To find the volume,

Volume  =  area of cross-section × length

Volume  =  (area of the rectangle + area of the square)  × length

=  [(s2) + (l × w)] × length

we have,

side (s) = 4 cm, length (l) = 8 cm, width (w) = 4 cm and length  =  9 cm

Volume  =  [(42) + (8 × 4)] × 9

=  (16 + 32) × 9

Volume =  432 cm3

Problem 7 :

Solution :

By observing the figure, it is a semicircle prism.

Here area of cross-section is the shape of the semicircle.

To find the volume,

Volume  =  area of cross-section × length

Volume  =  area of the semicircle  × length

=  1/2 πr× length

we have,

diameter  =  6 cm,

radius (r)  =  6/2  =  3 cm and length (l)  =  18 cm

= 1/2π(3)× 18

= (1/2 × 3.14 × 9) × 18

= 14.13 × 18

Volume = 254 cm3

Problem 8 :

Solution :

By observing the figure, it is a parallelepiped.

Here area of cross-section is the shape of the parallelogram.

To find the volume,

Volume  =  area of cross-section × length

Volume  =  area of the parallelogram × length

=  (b × h) × length

we have,

base (b) = 12 cm, height (h) = 8 cm and length = 3 cm

Volume = (12 × 8) × 3

Volume = 288 cm3

Problem 9 :

Solution :

By observing the figure, it is a house-shaped prism.

Here area of cross-section is the shape of the triangle and square.

To find the volume,

Volume  =  area of cross-section × length

Volume  =  (area of the triangle + area of the square)  × length

= (√3/4 a+ s2× length

we have,

side (s) = 9 cm, side (a) = 9 cm and length = 20 cm

= [√3/4(92) + 92× 20

= 116 × 20

Volume = 2321 cm3

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