It is: 0.5*8*10 = 40 square feet
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70 ft
The area of the rhombus is 40 square feet. To see why, Draw a rectangle encompassing the rhombus with sides parallel to the rhombus' diagonals. The rectangle has dimensions 10 ft X 8 ft = 80 square ft. Using the diagonals as dividers, each quarter of the rectangle is divided into 2 by one of the rhombus' sides. Thus the area of the rhombus is exactly half that of the encompassing rectangle.
Rhombus comprises 4 triangles which can be arranged to form 2 rectangles 5' x 6', so total area is 60 ft2.
two sides 12 ft and two sides 10 ft is 120 sq ft (12*10)
A(rect) = w * l = 12ft*10ft = 120ft2Length * width = area10 * 12 = 120