Figure out statement and proof write them down in section 20 points

1. ∠1 ≅ ∠2               1. Given

2. ∠1 ≅ ∠3              2. Vertical Angle Theorem

  ∠2 ≅ ∠4            

3. ∠2 ≅ ∠3             3. Transitive Property refer to Statements 1 & 2

4. ∠3 ≅ ∠4             4. Transitive Property refer to Statements 3 & 2

a_n = a_1 + (n - 1)d

the first term is 6.

the common difference d = ?

when you find d, replace n with 7 and d with the common difference to find your answer.