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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?

 

 Jan 18, 2021

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 #1
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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.

 Jan 18, 2021
 #1
avatar+536 
+1
Best Answer

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.

MooMooooMooM Jan 18, 2021

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