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15 September, 16:38

In ΔDEF,{EF}/cong{DE} EF ≅ DE and m∠E = 104°. Find m∠D.

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  1. 15 September, 16:43
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    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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