No, a trapezoid cannot have 3 bases. A trapezoid is a quadrilateral with exactly one pair of parallel sides. The parallel sides are called bases of the trapezoid. Therefore, there can only be 2 bases.
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Work out each figure separately then add them together: Area of a trapezoid = 0.5*(sum of parallel bases)*height Area of a rectangle = length*height
The area of a trapezoid is equal to the height, multiplied by the average of the two widths.
Area of a trapezoid = 0.5*(sum of parallel sides)*height
If you take a regular four sided pyramid and chop off the top, parallel with the base, the left over piece would be a solid with four identical trapezoidal faces and a square top and bottom. The only name I know is 3-D trapezoid.
Never. It's impossible. If there are two acute angles, it means there have to be two obtuse angles, so three acute angles is impossible.