Volume of a Pentagonal Pyramid
Volume calculator for a pentagonal pyramid
Description, how many faces, edges and vertices are there in a pentagonal pyramid
The pentagonal pyramid, is a pyramid with a pentagon-shaped base. It has 6 faces, 5 faces are triangles that form the sides and one face considered the base, which in this case it's a pentagon. It has 10 edges and 6 vertices.
Formula for the volume of a pentagonal pyramid
To calculate the volume of a pentagonal pyramid, we must first know the area of its base. In other words, we must calculate the area of a pentagon (base). To get the area of a pentagon we need to multiply the perimeter of the pentagon by the apothem and then divide the result by 2.
Once we have the area of the base (area of the pentagon), we multiply the result by the height of the pyramid and finally, we divide it by 3.
All of the above is the same as multiplying 5 by the length of one side, then multiply it by the apothem, then by the height and finally divide the result by 6. You can also use the online calculator to calculate the volume of the pentagonal pyramid automatically.
Formula explanation and alternative formula:
The formula to calculate a pyramid is always the same:
In this case the area of the base of the pyramid is the area of a pentagon, therefore:
To calculate the perimeter of a pentagon:
Perimeter = 5 × Side
Now we can replace the Perimeter in the formula (1):
To calculate the apothem:
and to calculate the height:
Finally, if we replace all the variables. We found another way to calculate the volume of a pentagonal pyramid without knowing the value of the apothem
Volume of other shapes
Volume of different geometric shapes: