Chapter 11, Problem 7STP

To determine

To Find: The common tangent on the given figure.

Answer to Problem 7STP

Thenumber of tangent must be 4 as shown in Figure 3

Explanation of Solution

Given:

The given diagram is shown in Figure 1

  

Figure 1

Calculation:

Consider the straight edge to look for the line as the tangent to both the circles,

Consider the two lines tangent to the outside of both the circle as shown in Figure 2

  

Figure 2

Consider the second tangent is shown in Figure 3

  

Figure 3

Thus, the number of tangent must be 4 as shown in Figure 3