What equation should I use to find the normal of a triangle?

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Homework Statement



The triangle obtained by tracing out the path from (6, 0, 0) to (6, 0, 2) to (6, 5, 2) to (6, 0, 0)

Homework Equations





The Attempt at a Solution



Should I use the following equation Ax + By + Cz = d and find the normal first?
 
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What is the question? You title this "equation of the triangle" but a triangle doesn't have an "equation". Do you mean to integrate some function over the region bounded by the triangle?
 
yes that's what I actually meant
 

Thread 'Prove that the integral is equal to ##\pi^2/8##'

Prove $$\int\limits_0^{\sqrt2/4}\frac{1}{\sqrt{x-x^2}}\arcsin\sqrt{\frac{(x-1)\left(x-1+x\sqrt{9-16x}\right)}{1-2x}} \, \mathrm dx = \frac{\pi^2}{8}.$$ Let $$I = \int\limits_0^{\sqrt 2 / 4}\frac{1}{\sqrt{x-x^2}}\arcsin\sqrt{\frac{(x-1)\left(x-1+x\sqrt{9-16x}\right)}{1-2x}} \, \mathrm dx. \tag{1}$$ The representation integral of ##\arcsin## is $$\arcsin u = \int\limits_{0}^{1} \frac{\mathrm dt}{\sqrt{1-t^2}}, \qquad 0 \leqslant u \leqslant 1.$$ Plugging identity above into ##(1)## with ##u...
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