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Home > CC2MN > Chapter 4 > Lesson 4.4.2 > Problem 4-142

4-142.

If each triangle below is drawn accurately, identify whether it is an obtuse, acute, or right triangle. Name the angle or angles that helped you to decide.  

  1. Examine all three angles of the triangle.
    Are any of the angles greater than, less than, or equal to ?

    Angle C is greater than , so this figure is an obtuse triangle.

  1. See (a).

    Since all the angles are less than , the figure is an acute triangle.

  1. What does the box on angle Y mean?

    The box means that the angle at that point is a right angle.
    How can you identify this triangle?

  1. See part (a).