Volume of a pyramid
Look carefully at the pyramid shown below. The volume of a pyramid can be computed as shown
We will start with a pyramid that has a square as the base.
Volume = (B × h)/3
B is the area of the base
h is the height
The base of the pyramid can be a rectangle, a triangle, or a square. Compute the area of the base accordingly
Volume of a square pyramid
A square pyramid has a height of 9 meters. If a side of the base measures 4 meters, what is the volume of the pyramid?
Since the base is a square, area of the base = 4 × 4 = 16 m2
Volume of the pyramid = (B × h)/3 = (16 × 9)/3 = 144/3 = 48 m3
Volume of a rectangular pyramid
A rectangular pyramid has a height of 10 meters. If the sides of the base measure 3 meters and 5 meters, what is the volume of the pyramid?
Since the base is a rectangle, area of the base = 3 × 5 = 15 m2
Volume of the pyramid = (B × h)/3 = (15 × 10)/3 = 150/3 = 50 m3
Volume of a triangular pyramid
A triangular pyramid has a height of 8 meters. If the triangle has a base of 4 meters and a height of 3 meters, what is the volume of the pyramid?
Notice that here, you are dealing with two different heights. Avoid mixing the height of the pyramid with the height of the triangle
Since the base is a triangle, area of the base = (b × h)/2 = (4 × 3)/2 = 12/2 = 6 m2
Volume of the pyramid = (B × h)/3 = (6 × 8)/3 = 48/3 = 16 m3
Sep 25, 17 09:22 AM
Writing an algebraic expression when a phrase is given is the goal of this lesson
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