
Concept explainers
a.
To show that volume of pyramid is
a.

Explanation of Solution
Given information:
Length of each of the 8 edges of pyramid is
We know that the volume of the pyramid is given by,
Now we determine the area of base.
It can be observed that the base of pyramid is a square with side
Hence the area of the base becomes
Now we determine the height of the pyramid.
From the given figure we can observe that EHC form a right angle
Side EH is height (name the base point of
Side HC is the base of the right angle triangle EHC of the length half that of diagonal of square ABCD
Diagonal of the square is
Hence side EH is
Side EC is the hypotenuses of the triangle EHC of length
Now using Pythagoras theorem in triangle EHC we get,
Hence the height is
Now we put the value of base area and the height in the formula we get,
Multiply
b.
To find the value of
b.

Explanation of Solution
Given information:
Volume is given 9
Now we equate the value with the formula
Take cube root both sides we get,
Chapter 6 Solutions
Algebra and Trigonometry: Structure and Method, Book 2
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