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Elementary Geometry for College St...

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

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BuyFindarrow_forward

Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698
Textbook Problem
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Given: A B ¯ is an external tangent to O and Q at points A and B; radii lengths for O and Q are 4 and 9.

Find: AB

Chapter 6.3, Problem 37E, Given: AB is an external tangent to O and Q at points A and B; radii lengths for O and Q are 4 and

(HINT: The line of centers O Q ¯ contains point C, the point at which O and Q are tangent.)

To determine

To find:

The find the value of AB.

Explanation

Given that, AB¯ is an external tangent to O and Q at points A and B; radii lengths for O and Q are 4 and 9.

The line of centers OQ¯ contains the point C in which the circles are internally tangent. Then draw the tangent and join O, Q with P.

The diagrammatic representation is given below,

From the above graph PA¯,PC¯ tangents from the exterior point P to circle O. That is, PO¯ bisects APC therefore, PA=PC.

From the above graph PB¯,PC¯ tangents from the exterior point P to circle Q. That is, PQ¯ bisects CPB therefore, PC=PB.

Then add the angles to get the following,

mOPQ=mOPC+mQPC=mAPC2+mCPB2=mAPC+mCPB2=90+90"

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