- #1

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## Homework Statement

consider the area of a plane in first octant where a,b,c,d are postive real numbers

show that the area is [d

^{2}sqrt(a

^{2}+b

^{2}+c

^{2})] / 2abc

## Homework Equations

ax+by+cz = d

## The Attempt at a Solution

ok i tried to search for formulas for areas of planes but there seem to be none !

i found one at paula's calculus notes that is about using surface integrals but it seems not for this problem?

can anyone point me to the right direction? thanks!