EXAMPLE 1 Apply the Base Angles Theorem
SOLUTION
In DEF, DE DF . Name two congruent angles.
DE DF , so by the Base Angles Theorem, E F.
GUIDED PRACTICE for Example 1
SOLUTION
Copy and complete the statement.
1. If HG HK , then ? ? .
HGK HKG
GUIDED PRACTICE for Example 1
Copy and complete the statement.
If KHJ KJH, then ? ? .If KHJ KJH, then ? ? .2. 2.
SOLUTION
If KHJ KJH, then , KH KJ