Triangle Angle Sum - Activity A


Measure the angles of a triangle and find the sum. Then reshape and resize the triangle and confirm that the sum of angle measures is the same for all triangles.

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Assessment Questions (4):

  1. In triangleABC, if mangleA = 67° and mangleB = 83°, what is mangleC?
  2. Find the value of x in the triangle shown below.

    triangle has one angle of measure 38, one angle of measure 103, and one angle of measure x.
  3. Which of the following describes the triangle below?

    a triangle, two sides of which have congruence marks.
  4. If the measures of two of the angles of a triangle are 42° and 48°, which of the following words best describes this triangle?

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