That's correct! The area of a rhombus is equal to the square of its side length. This relationship holds true because the diagonals of a rhombus are perpendicular bisectors of each other, dividing the rhombus into congruent right triangles. By using the Pythagorean theorem to relate the side length and the diagonal lengths, we find that the side length squared is equal to the sum of the squares of the diagonal lengths. This relationship allows us to simplify the area formula to just the square of the side length. So, to find the area of a rhombus, you simply need to square the length of one of its sides. Well done!