In triangle ABC, AB = AC = 25 and BC = 20. Points D, E and F are on sides AB, BC and AC respectively, such that DE and EF are parallel to AC and AB respectively. What is the perimeter of parallelogram ADEF?
+538 EFC is an isosceles triangle. So AF + EF will equal one of the larger sides of the biggest triangle. Since it is a parallelogram, the same holds true for AD+DE. So AC is 25 and 25+25=50.
+538 EFC is an isosceles triangle. So AF + EF will equal one of the larger sides of the biggest triangle. Since it is a parallelogram, the same holds true for AD+DE. So AC is 25 and 25+25=50.
