The formula for finding the diagonals of any polygon is: 0.5*(n2-3n) where n = the number of sides.
A trapezoid has 4 sides so: 0.5*(16-12) = 2 diagonals
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by the formula of ---A*b
Area of a trapezoid = 0.5*(sum of parallel sides)*height
A diagonal always forms an angle bisector in a square. In a rectangle, trapezoid, or any other quadrilateral, a diagonal does not always bisect the angles.
Trapezoid
A trapezoid.