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Home > MC2 > Chapter 9 > Lesson 9.2.3 > Problem 9-65

9-65.

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

  1. A right triangle where the vertices are labelled C, A, T.  The right angle is at A.

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

    The box on angle A indicates that angle A is a right angle.
    The figure is therefore identified as a right triangle.

  1. A triangle where the vertices are labelled M, U, G.

    See part (a).

    Can you explain why this is an acute triangle?

  1. A triangle where the vertices are labelled W, E, B.

    See part (a).

    This figure is an obtuse triangle because one of its angles is greater than .

  1. A triangle where the vertices are labelled T, O, P.

    See part (a).