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Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

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BuyFindarrow_forward

Elementary Geometry For College St...

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

In Exercises 25 to 28, Δ A B C Δ D B E

Exercises 25-28

Given: AC = 10, DE = 12, AD = 4.
Find: DB

To determine

To find:

The side DB when the given sides are AC = 10, DE = 8, AD = 4 and ΔABCΔDBE.

Explanation

Definition:

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 DBE and which is given that two triangles are similar.

Now draw the two triangles separately as shown below.

Figure 2

Figure 3

Since ΔABCΔDBE and from the definition of CSSTP, corresponding sides of similar triangles are proportional.

That is, BDBA=BEBC=DEAC.

It is given that AC = 10, DE = 8, AD = 4.

Find the side DB.

Consider the first and last two pairs of proportions DBAB=DEAC in order to find DB.

From Figure 1, it is observed that AB=AD+DB.

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