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.
James Marshall finds gold James Marshall was working in California to build a water pump. While in the river he found a shiny metal which turned out to be gold. March 1848: Reports about gold aren't believed A local newspaper heard about the gold discovery and reported about it. Most people in the area didn't believe it. August 1848: The gold rush begins James Marshall tried to keep his discovery a secret, but word quickly spread. By August there were 4000 gold mines in the areas. November 1848: The first minted gold The first shipments of gold sent to the mint left from San Francisco. The ship carried over $500,000 of gold. 1849: The coming of the 49'ers