Your Turn 1 According to Theorem 1 label the parallelogram with the appropriate tick marks I If a quadrilateral is a I parallelogram then If a quadrilateral is a parallelogram then B 2 According to Theorem 2 label the parallelogram with the appropriate tick marks If a quadrilateral is a parallelogram then B Tick marks show congruency 3 According to Theorem 3 label the parallelogram with the appropriate tick marks B Tick marks show congruency Use the Glossary if you come across any unknown words