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Quadrilateral Resources

Lessons

Properties of Trapezoids and Kites Now that we've seen several types of quadrilaterals that are parallelograms, let's learn about figures that do not have the properties of parallelograms. Recall that parallelograms were quadrilaterals whose opposite sides were parallel. In this section, we will look at quadrilaterals whose opposite sides may intersect at some point. The two types... read more

Lessons

Proving Quadrilaterals Are Parallelograms In the previous section, we learned about several properties that distinguish parallelograms from other quadrilaterals. Most of the work we did was computation-based because we were already given the fact that the figures were parallelograms. In this section, we will use our reasoning skills to put together two-column geometric proofs... read more

Lessons

Properties of Parallelograms The broadest term we've used to describe any kind of shape is "polygon." When we discussed quadrilaterals in the last section, we essentially just specified that they were polygons with four vertices and four sides. Still, we will get more specific in this section and discuss a special type of quadrilateral: the parallelogram. Before we... read more

Lessons

Polygons Before we get too caught up on the excitement of quadrilaterals, let's take time to learn the names and basic properties of different polygons. Polygons are two-dimensional, closed, plane shapes composed of a finite number of straight sides that meet at points called vertices. Triangles, which we have already learned about, are one type of polygon. In this section we will... read more

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