This document provides formulas for calculating the areas of various shapes including squares, triangles, rectangles, trapezoids, rhombuses, circles, semicircles, cylinders, and semicylinders. It states that the area of a square is side squared, a triangle is half base times height, a rectangle is base times height, a trapezoid is half the sum of the bases times the height, a rhombus can be half the product of the diagonals or base times height, the area of a circle is pi times the radius squared, a semicircle is pi times the radius squared over 2, and the area of a cylinder or semicylinder is pi times the radius squared times the height or half