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19 May, 09:28

Elise is measuring the angles of a triangle. She measures the first two and gets 30° and 100°. What should be the measure of the third angle?

A) 50°

B) 60°

C) 130°

D) 230°

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Answers (1)
  1. 19 May, 12:31
    0
    The sum of angles in a triangle is 180°.

    To obtain the third angle (let's call it x), we simply calculate thus:

    30° + 100° + x = 180°

    130° + x = 180°

    x = 180° - 130°

    x = 50° ... (A)
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