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The sum of all the angles in a trapezoid is 360 degrees. That means that in trapezoid sum of two interior angles on the same leg is 180 degrees. Because angles B and H are the same, the sum of angles B and E is 180 degrees. Now, if two straight lines are parallel, and one straight line intersects both, there is a relation between angles that line makes with two parallel lines.įor example, in the picture below, angles E and C and G and A are the same. Isosceles trapezoid is trapezoid which has equal legs. It is just the sum of lengths of its sides. Note: Some define a trapezoid as a quadrilateral with at least one pair of parallel sides implying that it could contain two pairs of parallel sides, which would make it a parallelogram. The figure below shows a few different types of trapezoids. The formula for the perimeter of a trapezoid is like for any other polygon. A trapezoid is a quadrilateral with one pair of parallel sides. However, an even stricter definition says that a trapezoid is a quadrilateral with exactly one pair of parallel sides. By this definition, shapes like rectangles and squares are trapezoids. That means that, by loose definition, a trapezoid is every quadrilateral with at least one pair of parallel sides. Parallel sides are bases, and the other two are called legs. Trapezoid (sometimes called trapezium) is a polygon with four straight sides, two parallel. Check out our Trigonometric Functions Calculator, Antilog Calculator, or some other in math section. In addition, if you are interested in math and geometry, you can find more useful tools on our site. With our Trapezoid calculator you will be able to calculate area, angles and height of trapezoid. Handbags, boats, and many packagings are all in a trapezoid shape. For example, if you look at the rectangle from the proper perspective, you will see a trapezoid. A trapezoid is a “cousin” of shapes like rectangles and squares. Things like the Pythagorean theorem for right-angle triangles and the formula for the circle area are just proof that geometry is the most exciting area of math. Since the beginning of humankind, humankind has been interested in all kinds of geometrical shapes.