No. Base times half the altitude gives the area.
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4 faces are triangles and 1 face is a square the square face is the base of the pyramid
A=1/2bh The area of a triangle is 1/2bh. If the base of it is a triangle and all 4 of the triangles aren't the same, then you have to find the area of the base triangle and then the three other triangles (which should all have the same area). If all four of the triangles have the same area, then just find the area of one of the triangles and multiply that by four. A triangular pyramid that has four equal triangles is also called a tetrahedron.
One side will be a square. It is the base. The lateral sides are triangles.
The base of square pyramid is a square, as you may have guessed. If you measure one side of the square base, you'll have discovered the length of a side of the base. A side squared (a side times a side) will give you the area of the base of a square pyramid. If you have the area of the base, you can find the length of a side of the base by finding the square root of the area of the base. In the case of a square pyramid, if you are given the length of a side and either a vertex angle or the angle between the base and a side, you'll have an isosceles triangle to deal with. (There are four isosceles triangles that make up the faces of the square pyramid, as you probably figured out.) This involves a bit of trigonometry, and there are some other questions here that will help you figure that out.
the base is a 2-d square with joined triangles, meeting together to make a corner at the top, the triangles height can be any height, or the square can be any size