Khan Academy on a Stick
Proof - Rhombus Area Half Product of Diagonal Length
Showing that we can find the area of a rhombus by taking half the product of the lengths of the diagonals
If the above player doesn't work, you can try this direct link.
Showing that we can find the area of a rhombus by taking half the product of the lengths of the diagonals
If the above player doesn't work, you can try this direct link.