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- Homework Statement
- A plane in 3D Cartesian coordinate system, defined by these 3 points (a,0,0), (0,2a,0), (0,0,a), find the area bounded in the 1st octant.

- Homework Equations
- No particular equation in mind.

I know how to find the area of a plane which is parallel to the xy-, yz-, or, xz-plane, those are the easiest case. I also tried to find the area of a plane which is only perpendicular to 1 particular axis plane, like the one passing through points (0,0,a), (a,0,a), (0,2a,0), in which case, dA=\sqrt 5 dx dy. However, when it comes to planes that are not this special, I don't know where to start.

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