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.
On January 24, 1848 James Marshall discovered gold at Sutter's Mill, touching off the California gold rush. On the 150th anniversary of Marshall's discovery, the Oakland Museum of California unveiled a series of exhibitions titled Gold Rush!California's Untold Stories.They are now closed at the Oakland Museum.ontact the Webmaster. On January 24, 1848 James Marshall discovered gold at Sutter's Mill, touching off the California gold rush. On the 150th anniversary of Marshall's discovery, the Oakland Museum of California unveiled a series of exhibitions titled Gold Rush! California's Untold Stories.