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Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

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Section
BuyFindarrow_forward

Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085
Textbook Problem

In the figure, A B C A D B . Find AB if A D = 2 and D C = 6 .

To determine

To find:

The length of the side AB if the given sides are AD = 2, DC = 6 and ABCADB.

Explanation

Definition:

AA:

If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.

CSSTP:

Corresponding sides of similar triangles are proportional.

Description:

The given figure is shown below.

Figure 1

From the given figure, it is observed that there are two triangles ABC and ADB.

Now draw the two triangles separately as shown below.

Figure 2

Figure 3

Given that ABCADB and the point A is common for both the triangles. So by identity AA.

From the above mentioned AA definition, the two triangles ABC and ADB are similar since the two angles of one triangle are congruent to two angles of another triangle. Hence, ΔABCΔABD.

From the definition of CSSTP, corresponding sides of similar triangles are proportional.

That is, ABCA=ADAB=BDCB.

It is given that AD = 2, DC = 6

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