23 > CT PREP MATH PART-ACT Math Test 1 - Edition 3 Question 23 of 60 Betty attempted to prove that the diagonals of a parallelogram bisect each other, using the image shown. In which step did Betty make her first error? Step 4 O Step 6 R Statements 1. Diagonals PR and QS intersect at point Given T 2. PQ and RS are parallel. PS and QR Given are parallel. 3. PQRS 4. QPR SRP PQSRSQ 5. APQTARST Reasons Opposite sides of a parallelogram are congruent Alternate interior angles theorem SAS congruence criterion Corresponding parts 6. PT RT QT of congruent ST triangles are congruent 7. PR and QS bisect Definition of each other segment bisector