Question
Asked Oct 11, 2019
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A triangle has vertices 

(0, 0, 0), (1, 1, 1),

 and 

(0, −4, 5).

 Find its area.

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Expert Answer

Step 1

Consider the triangle with vertices (0, 0, 0), (1, 1, 1) and (0, -4, 5)

Let  A(0, 0, 0), B...

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Image Transcriptionclose

AB (1-0,1-0,1-0)=(1,1,1) AC (0-0,-4-0,5-0)(0-4,5) ij k ABx AC = 1 1 1 0 -4 5 =(5+4)-(5-0)+k(-4-0) 9i-5j-4k

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