1. A, B, C, D – the tops of the parallelogram. S – area. h = height.
2.S trapezoid ABED = (DE + AB) / 2 x h.
AB = CD, since the opposite sides of the parallelogram are equal.
DE = 1/2 CD according to the problem statement.
3. Substitute 1/2 CD instead of DE and CD instead of AB into the original expression:
S trapezoid ABED = (CD / 2 + CD) 2 x h = 3SD / 4 x h.
CD x h is the S of the parallelogram. CD x h = 56.
S trapezoid ABED = 56 x 3/4 = 42 units.
Answer: S trapezoid ABED = 42 units.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.