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Home > MC2 > Chapter 9 > Lesson 9.2.2 > Problem 9-54

  1. 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. Homework Help ✎

Examine all three angles of the triangle.
Are any of the angles greater than, less than, or equal to 90°?

Angle C is greater than 90°, so this figure is an obtuse triangle.

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?

See (a).

Since all the angles are less than 90°, the figure is an acute triangle.

See (a).