Quatr.us > Math >Geometry > Quadrilaterals > Rhombuses. Rhombus. A rhombus is a kind of quadrilateral that has two sides that are parallel to each other, and another two sides that are parallel to each other. A rhombus is a special kind of parallelogram, and squares and rectangles are special kinds of rhombus. To figure out the perimeter of the rhombus, you can add the lengths of all the sides together. To figure out the area of a rhombus, you have to cut it into shapes that are easier to figure out. You want to cut it into a rectangle and two right triangles.
James Marshall's discovery of gold at Sutter's Mill in California in 1848, started the California Gold Rush.
He built Sutter's Fort at the site of present day Sacramento. At Sutter's Fort he developed farming and other businesses. Sutter's Fort became a rest station for travelers and immigrants to California. Above right is a picture of Sutter's Fort at the time of the Gold Rush. In 1847 John Sutter hired James Marshall to build a sawmill at a site named Coloma. At the right, below, is a picture of the Mill at Coloma.