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11.5 Alternate angles




Introduction

Starting with a list of all angles in a parallel line:

An example of corresponding angles (already discussed) are b and f, meaning b=f.

An example of vertically opposite angles (already discussed) are b and c, meaning b=c.

Since b=f and b=c, therefore, c=f. These angles are called alternate angles, since they are on alternate sides of the transversal.

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