Base times Height divided by three.
The base is perpendicular to the height, which ends at the highest point of the pyramid.
To find the area of the base, one simply uses 2-dimensional geometry.
Triangle: Base of triangle times height of triangle over 2
Any regular polygon: Apothem (perpendicular distance from orthocenter to a side) times perimeter divided by 2.
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Using the dimensions you're given and those that you can calculate . . .-- Calculate and write down the area of each face of the pyramid.-- Then add up all of the individual areas.-- The sum is the surface area of the pyramid.
Volume=1/3 area of the base x height
SA equals pi times the radius squared
first you find the area of the base and then you find the area one side of the pyramid an you time it with 3 if it is a triangular pyramid or 4 if it is a square pyramid
# Square Pyramid:#* Identify the length and width of the base. Write your measurements down. #* Calculate the area of the base. This is done by multiplying the width by the height. Write the answer down. #* Multiply the area of the base by the height. Write this answer down, too. #* Multiply the previous answer by one third, or divide by 3. This will give you the final answer. # Triangular Pyramid:#* Identify the length and width of the base. Write the measurements down. #* Calculate the area of the base.Multiply the length by the width, then multiply by one half (or divide by 2). This is the area. Write the answer down. #* Multiply the area of the base by the height of the pyramid.#* Multiply your answer by one third, or divide by 3. This will give you the volume.Source: WikiHow