1. <AFC and <EFD are vertical angles

2. <BAD and <BDA are complementary angles

3. <ECB and <ECD is a linear pair

4. x+2 = 2x - 6

x = 8

m<RPT = 2(x+2) = 2(8+2) = 2(10) = 20

5. a linear pair consists of 2 adjacent angles who's uncommon sides form a straight line.

6. her error is the original equation 4x+2x = 180, it should be 4x+2x = 90

therefore 6x = 90

x = 15

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