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svlad2 [7]
3 years ago
13

What is the length of DF? F За IT E G a +6 D DF =

Mathematics
1 answer:
Solnce55 [7]3 years ago
5 0

Answer:

  18

Step-by-step explanation:

Triangles FEG and DEG are congruent by SAS, so DG = FG.

  a+6 = 3a

  6 = 2a

  3 = a

  3a = 3·3 = 9 = FG = DG

DF = 9+9 = 18

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