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www.algebra.com/algebra/homework/Polygons/Trapezoids-and-their-base-angles.lesson

Trapezoid is a quadrilateral which has two opposite sides parallel and the other two sides non-parallel (see the Figure 1). ... The angles at the ends of the larger base of a trapezoid are called the base angles (the angles LA and LB in Figure 1) . A trapezoid is called ... It means that the triangle EBC is the isosceles triangle.

The triangle creeps into this page because we need to know its area in order to compute the area of a trapezoid. A quadrilateral with only two of its sides parallel is called a trapezium, or trapezoid. There is a confusing difference in meaning between the USA and elsewhere with these terms, where a trapezium in the USA  ...

www.analyzemath.com/Geometry/trapezoid_problems.html

Trapezoid problems with detailed solutions. ... trapezoid problem 1. Solution to Problem 1: Use the sine definition in a right triangle to find the height h of the trapezoid. sin D = h / CD; Solve the above for h. h = CD * sin D = 2 * sin 40; Use the formula of ... S = 0.5 * (DO + OC + CD) = 0.5 * (40 + 96 + 104) = 120 area = sqrt [ s(s ...

www.thoughtco.com/definition-of-a-base-2312351

Jun 30, 2014 ... Definition of a Base. Understand the meaning of base as it related to math.

Let's rewrite this to say: A square satisfies the definition of an isosceles trapezoid. Is this always, sometimes or never true? Well, a square is super-satisfying after all… but the trapezoid is the one type of shape a square does not satisfy! That's because trapezoids are only allowed to have one set of parallel sides, and squares ...

mathspace.co/learn/world-of-maths/geometry/properties-of-2d-and-3d-shapes-and-solids-18523/properties-of-2d-shapes-1346

The word polygon comes from the Greek poly - meaning many and gonos - meaning angles. ... 2 pairs of adjacent angles equal; A trapezoid (trapezoid) has one pair of opposite sides parallel; An isosceles trapezoid (trapezoid) has one pair of opposites sides equal; Diagonals of an isosceles trapezoid (trapezoid) are equal ...

mathblog.com/reference/geometry/trapezoid

Students sometimes get confused when it comes to finding the area of a trapezoid, simply because they do not know how to properly label the shape so they can plug the right numbers into the ... In the US, the term means a quadrilateral with one pair of parallel sides while in the UK, a trapezoid has no parallel sides.

jd2718.org/2014/05/26/politicizing-the-trapezoid

May 26, 2014 ... Of all the bad things ed reform is doing and has done, changing a definition without discussion is not high on the list. And, in this case, its not that Coleman is out to screw kids (he is, but does he care about trapezoids? He has millions of children who he treats with disregard, what's a silly shape to him?)

www.dominatethegmat.com/2011/02/gmat-math-tip-trapezoids

Feb 22, 2011 ... The formula for the area of a trapezoid is still A = b*h. The question is, which base do you use? See, the problem with trapezoids is that they have two bases, each of which is a different length. With rectangles, for example, it's easy — either base you pick, by definition, is the same length as the parallel side ...