Lesson 1: The Tangent Ratio - Alternate Angle Investigation

   Constructing Knowledge


Alternate Investigation


If you were unable to access the Right Triangles applet, complete the following activity.

  1. Draw 4 right triangles and measure the angles in each triangle. Find the sum of the three angle measures in each triangle. What do you notice?

  2. Use what you learned in part 1 to answer the following questions.

    1. If two angle measures in a right triangle are 90° and 50°, what is the measure of the third angle?

    2. If one acute angle in a right triangle measures 25°, what is the measure of the other acute angle?

  3. Is there enough information provided to conclude that the following two triangles are similar? Explain.



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