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Lime

Here we go again. Tired of these yet? Obtuse triangles. <DGF = 84°, then <DEF = ?° 42° 84° 48° none of these

  • one year ago
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  1. Lime
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    • one year ago
  2. Lime
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    The sum of interior angles in an obtuse triangle is 180°.

    • one year ago
  3. Lime
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    I'm pretty sure I have gotten this down. 180° - 84° = solution.

    • one year ago
  4. campbell_st
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    well the 2 curved arcs that make DGF also make DEF.. so I'd say the angles are equal... and in a kite those angles are equal...

    • one year ago
  5. campbell_st
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    oh and the triangle DGF is reflected in the line DF to form DEF...

    • one year ago
  6. Lime
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    With the answers provided, "none of the above" would be equal to 96°, yes?

    • one year ago
  7. campbell_st
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    the angles DEF and DGF are not supplementary... which is what you have done... they are congruent

    • one year ago
  8. Lime
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    \[\angle DGF ≅ \angle DEF \] by ASA method?

    • one year ago
  9. campbell_st
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    but I don't think you need to prove congruency... just recognise the equal angle markings..

    • one year ago
  10. Lime
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    84° is equal to 84°.

    • one year ago
  11. campbell_st
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    correct

    • one year ago
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