First slide

Introduction to 3-D Geometry

Question

The area of the triangle formed by the points (2,3,5), (-1,3,2) and (3,5,-2) is

Moderate

A

$18 \sqrt{2}$
B

9
C

18
D

$9 \sqrt{2}$

Solution

Triangle area $= |\frac{\vec{A B} \times \vec{A C}}{2}|$
d.r s of AB=(-3,0,-3)
d.r s of AC=(1,2,-7)
to find cross product

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