wsudder wsudder
  • 28-01-2020
  • Mathematics
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In ΔDEF,{EF}\cong{DE} EF ≅ DE and m∠E = 104°. Find m∠D.

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musiclover10045
musiclover10045 musiclover10045
  • 28-01-2020

The 3 inside angles need to equal 180.

Subtract E from 180 to find the sum of the other two angles:

180 - 104 = 76

Now because EF ≅ DE , angle D and F would be the same so divide 76 by 2

Angle D = 38

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