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2013 AMC 10A Problem 12

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2013 AMC 10A Problem 12AMC 10 Step by Step

Name: Date: September 13, 2026

Similar & Congruent Triangles · difficulty 2 of 5 · about 3 min · position P11-15

In $\triangle ABC$ , $AB=AC=28$ and $BC=20$ . Points $D,E,$ and $F$ are on sides $\overline{AB}$ , $\overline{BC}$ , and $\overline{AC}$ , respectively, such that $\overline{DE}$ and $\overline{EF}$ are parallel to $\overline{AC}$ and $\overline{AB}$ , respectively. What is the perimeter of parallelogram $ADEF$ ?

A)
$48$
B)
$52$
C)
$56$
D)
$60$
E)
$72$

2013 AMC 10A Problem 12

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