While shopping at the school bookstore, Ric purchased 4 book covers for $1.25 each , and a pen that cost 2/5 as much as the book
2 answers:
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Answer:
The area of the triangle is
Step-by-step explanation:
Using the fact that the area of the triangle having u and v as adjacent sides is given by
We know that we want to take a cross product to compute the area of the triangle, but we need to be careful because it doesn't make sense if we take the cross product of points.
The first step is to build some vectors that describe this triangle.
According with the graph we can build the vectors:
and
The vector is the difference of point B minus point A
and the vector is the difference of point C minus point A
Next we need to find the cross product of this vectors.
This is the definition of cross product of two vectors in space:
Let and
be vectors in space. The cross product of
and
is the vector
Applying this definition we get
The area of the triangle is
