What is surface area and whats its equation

The surface area is the area of a 3d shape's surface. For example, the surface area of a cube, with a length of 3, would be( 3*3)*6. this is because 3*3 would give you the area of one side, and because all 6 sides are the same, you times it by 6.

It's equation would be how you did it. Because an equation is basically a mathematical word for sum, using the example above, the equation for that would simply be (3*3)*6.

Hope I helped :-)

Surface area is the area of the surfaces that make the shape summed together.

The equation for surface depends on the shape of the object.

The surfaces area of a cube = 6s^2 where s is the length of a lide of the cube