Grade 8 Geometry
to calculate volume you use the formula
V= area of b.s.(base area) x h(height)
 How can I tell what face is the "base shape", especially with a triangular prism?

In a triangular prism V=(1/3)x(Base Area)x(Height)
To find Base Area in the case of triangular prism we use the formula for area of a triangle that is A=(1/2)x(L+W)posted by Joe

Joe, what you stated is the volume of a pyramid.
The volume of a triangular prism = base area x height
http://www.google.ca/imgres?imgurl=http://upload.wikimedia.org/wikipedia/commons/2/21/Triangular_prism.png&imgrefurl=http://commons.wikimedia.org/wiki/File:Triangular_prism.png&h=1000&w=1000&sz=147&tbnid=3nAf5nE8vVoM8M:&tbnh=149&tbnw=149&prev=/images%3Fq%3Dtriangular%2Bprism&hl=en&usg=__i8aqcfEydQvVJHrJFpcgp_Du9bQ=&ei=de7uS5HGsT48Abat9T9Cg&sa=X&oi=image_result&resnum=1&ct=image&ved=0CBgQ9QEwAAposted by Reiny
Respond to this Question
Similar Questions

6th grade math
Having problems with surface area of a triangular prism. I know the formula is ab + (S1 + S2 + S2)h, however I can't tell what all 3 sides of the trianle are from the picture. The triangular face shows a height of 50 in and a base 
geometry
The height of an equilateral triangular prism increases by one unit. The new lateral area is more than the original by how much? Answer the perimeter of the base the area of the base the height the area of one lateral face 
Geometry
A paperweight in the shape of a triangular prism has a height of 3 inches. its volume is 18 cubic inches. what is the area of the triangular base of the prism? 
geometry
For 1 through 10, what is the area and volume of the given shape, if the length of one side of the base is 6, the height is 8, and the slant height is 10? (Not all shapes will require all three numbers.) The shape is a right prism 
Geometry
5cm is one side of base height is 4cm base has 4 sides shape is a prism find lateral area and volume 
algebra 1
The formula for the volume, V, of a prism is V = Bh, where B equals the base area, and h is the height of the prism. What is the height of a prism with base area 21 cm2 and volume 84 cm3? 
Math
The volume of a triangular prism is 12cubic cm .atriangular face has base b and height h. The length of the prism is l. Find possible values for b, h and l. Sketch one possible prism that has an isosceles triangle as its base. 
Geometry
How do you go about finding the lateral area of a trianglar prism? Ex: The base of a triangular prism is an equilateral triangle with a perimeter of 42 cm. If the height of the prism is 10 cm, find the lateral area. Thanks for the 
Maths
The diagram shows a tent which has a rectangular base with vertical sides of height 2m, width 6m and length 8m, surmounted by a pyramid. The vertex,v, of the pyramid is 3m above the centre of the base of the tent Calculate the 
Math
A rectangular solid has a base area of 43.3 sq inches and a height of 50 inches a triangular prism has a base in the shape of an equilateral triangle and a height of 50 inches. the volumes for both shapes are equal. find the side