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In triangle DEF, if angle D = 40° and angle E = 70°, what is angle F?

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Question: In triangle DEF, if angle D = 40° and angle E = 70°, what is angle F?

Options:

  1. 70°
  2. 80°
  3. 60°
  4. 50°

Correct Answer: 80°

Solution: 

Angle F = 180° - (40° + 70°) = 70°.

In triangle DEF, if angle D = 40° and angle E = 70°, what is angle F?

Practice Questions

Q1
In triangle DEF, if angle D = 40° and angle E = 70°, what is angle F?
  1. 70°
  2. 80°
  3. 60°
  4. 50°

Questions & Step-by-Step Solutions

In triangle DEF, if angle D = 40° and angle E = 70°, what is angle F?
  • Triangle Angle Sum Theorem – The sum of the interior angles of a triangle is always 180°.
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