# The base of a triangular pyramid is a triangle with corners at #(8 ,5 )#, #(2 ,7 )#, and #(3 ,1 )#. If the pyramid has a height of #8 #, what is the pyramid's volume?

##### 1 Answer

you can also use determinant to get the area of the triangle:

#### Explanation:

This is a straightforward implementation of the Pyramid volume formula:

with same base and same height.

Now the volume of any prism is straightforward accumulation of the base area over the dimension of the height of the prism,

Now find the vector that enclose the triangle and use the cross product between them to find the Area,

The vectors are:

Now the cross product of any of this three vectors will yield the area of a parallelogram,

The angle between them is

Theta now since

Now we know height,

Thus the

You can use vectors

area

The angle between them is

The other way is simply determine the cross product using the determinant. Again let's consider

Then