Chapter 6.3, Problem 38E

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6th Edition

Daniel C. Alexander + 1 other

ISBN: 9781285195698

Textbook Problem

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The center of a circle of radius 3 inches is at a distance of 20 inches from the center of a circle of radius 9 inches. What is the exact length of common internal tangent

*(HINT: Use similar triangles to find OD and DP. Then apply the Pythagorean Theorem twice.)*

To determine

**To find:**

The find value of

Explanation

Given that, the center of a circle of radius 3 in. is at a distance of 20 in. from the center of a circle of radius 9 in.

That is

The diagrammatic representation is given below,

Since

Using the vertical angle theorem to get the following,

Therefore,

If two triangles are similar, then the ration of any two corresponding segments (such as altitudes, medians, or angle bisectors) equals the ratio of any two corresponding sides.

We know that,

Substitute this in the above equation to get the following,

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