By Stan Gibilisco
Try out offers a good, and absolutely painless technique to study the basics and normal suggestions of geometry. Self-teaching consultant bargains multiple-choice questions on the finish of every bankruptcy, and a 100-question self-test. Softcover.
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Additional info for Geometry Demystified: A Self-Teaching Guide
Fig. 3-14. The median of a trapezoid, also showing a transversal line. MEDIAN WITH TRANSVERSAL Look again at Fig. 3-14. Suppose L is a transversal line that crosses both the top of the large trapezoid (line segment PQ) and the bottom (line segment SR). Then L also crosses the median, line segment TU. Let A be the point at which L crosses PQ, let B be the point at which L crosses TU, and let C be the point at which L crosses SR. Then the lengths of line segments AB and BC are equal. There is a second fact that should also be mentioned.
Suppose PQRS is a trapezoid, with sides PQ and RS parallel. Suppose TU is a line segment parallel to both PQ and RS, and that intersects both of the non-parallel sides of the trapezoid, that is, sides PS and QR. Let L be a transversal line that crosses all three parallel line segments PQ, TU, and RS, 49 CHAPTER 3 Quadrilaterals 50 at the points A, B, and C respectively, as shown. In this scenario, if line segments AB and BC are equally long, then line segment TU is the median of the large trapezoid PQRS.
Perimeters and Areas Interior area is an expression of the size of the region enclosed by a polygon, and that lies in the same plane as all the vertices of the polygon. It is CHAPTER 3 Quadrilaterals expressed in square units (or units squared). The perimeter of a polygon is the sum of the lengths of its sides. Perimeter can also be deﬁned as the distance once around a polygon, starting at some point on one of its sides and proceeding clockwise or counterclockwise along the sides until that point is encountered again.