Because angles

*A*and

*C*are equal,

*AB*=

*BC*. So

*ABC*has sides of 5, 8 and 8, and therefore a perimeter of 21.

Because

*y*= 60, the third, unmarked angle in

*DEF*must also be 60°, so

*DEF*is equilateral. That means its sides are all 5, and its perimeter is 15.

21-15 = 6, so (C) is the answer.

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