   Chapter 10.2, Problem 39E ### Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698

#### Solutions

Chapter
Section ### Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698
Textbook Problem
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# Show that quadrilateral R S T V is an isosceles trapezoid. To determine

To prove:

The quadrilateral RSTV is an isosceles trapezoid. Explanation

To prove that the quadrilateral is an isosceles trapezoid, we have to prove the following conditions.

Two sides are need to be parallel, so that the quadrilateral is a trapezoid.

For an isosceles trapezoid, the other two sides are equal.

By theorem,

If two lines are parallel, then their slopes are equal.

(i.e) If l1l2, then m1=m2.

The slope of the line that contains the points x1,y1 and x2,y2 is given by

m=y2-y1x2-x1 for x2x1

Let mRS- and mTV- are the slopes of the line RS- and VT- respectively.

The given points are Ra, b, and Sc, b.

Using the slope formula and choosing x1=a, x2=c, y1=b, and y2=b.

mRS-=b-bc-a

mRS-=0c-a

mRS-=0

The given points are Va+d, e and Tc-d, e.

Using the slope formula and choosing x1=a+d, x2=c-d, y1=e, and y2=e.

mVT-=e-ec-d-a-d

mVT-=0c-a-2d

mVT=0

Here mRS-=mVT

Thus RS VT

If slopes are equal, then those lines are parallel

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