Please answer me Q#35 page#104 from the following link https://tstuition.wikispaces.com/file/view/3+-+Mensuration.pdf many many thanks

Think of this shape as two pyramids joined together.  Find
the area of one of the pyramids and multiply by 2.

Volume
of pyramid = area of base * height * 1/3

The base is a
square with sides of 10 cm.  The area of the base is 100 square
cm. 

Use the pythagorean theorem to find the
height.

a^2 + b^2 = c^2

a is
half the length of one of the sides, a = 5

c is the length
of one of the sides, c = 10

b is the height of the
pyramid.  solve for b

5^2 + b^2 =
10^2

25 + b^2 = 100

b^2 =
75

b = sqrt(75)

b = 5 *
sqrt(3)

Volume of the pyramid = area of base *
height

V = 100 * 5 * sqrt(3)

V
= 500 * sqrt(3)

This is the volume of one of the pyramids. 
Multiply this by 2.

1000 *
sqrt(3)

1732.05 cubic cm