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2. What is the volume of the regular pyramid to the nearest whole number?
14 cm
12 cm

2 What Is The Volume Of The Regular Pyramid To The Nearest Whole Number 14 Cm 12 Cm class=

Sagot :

291 cm^3

The volume of a pyramid is (area of base x height) / 3
In this case the base is an equilateral triangle with side 12cm.
Using the semi perimeter formula gives
Base = sr( 18 x 6 x 6 x 6) = 62.3538...
Volume = 62.3538... x 14 / 3 = 290.9845...
= 291 to nearest whole number

You could find the base area using Pythagoras and 1/2bh or the Sine formula