Questions 20 and 4

Line 1 Question 2 1 (known)

The second line AB is parallel to CD (parallel to two lines complementary to the inside corner).

Third row angle BAE= angle AEC (two parallel straight lines have the same internal angle)

The fourth line, AN, is parallel to me (the internal angle is equal and the two straight lines are parallel).

Angle NAE= of the fifth line = angle MEA (in the same way)

Sixth Row Angle BAE- Angle NAE= Angle AEC-MEA

Line 7 (Equivalent Substitution)

Add adoption