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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 Exercise 29 to 32, use the fact that triangles are similar.

As a garage door closes, light is case 6 ft beyond the base of the door (as shown in the accompanying drawing) by a light fixture that is set in the garage ceiling 10 ft back from the door. If the ceiling of the garage is 10 ft above the floor, how far is the garage door above the floor at the time that light is cast 6 ft beyond the door?

To determine

To calculate:

The distance when the garage door above the floor at the time that light is cast 6ft beyond the door.

Explanation

Given:

As a garage door closes, light is cast 6ft beyond the base of the door by a light fixture that is set in the garage ceiling 10ft back from the door. If the ceiling of the garage is 10ft above the floor.

Definition Used:

Similarity between Two polygons:

Two polygons are similar if and only if when all pairs of corresponding angles are congruent and all pairs of corresponding sides are proportional.

Calculation:

According to the segment-addition postulate, BD=BC+CD.

Let us assume that CD=x and BC=10x.

According to the definition of similar polygons, CDBC=ADBF

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