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## Homework subject

Hi! I didn't understand my maths lesson about planes, **how to find the equation of a plane** please?

## Homework progress

All I know is that **a plane** is a flat 2D surface. But then I didn't understand the rest of the explanation my teacher told us.

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Well,

you can define a plane with a Cartesian equationin three coordinates, normally x, y and z (or you can also use a vector equation).The Cartesian equation of a plane will be in the form ax + by + cz + d = 0.

Also know that a normal to a plane is a line or vector which is perpendicular to the plane, so it meets the plane at a right angle.