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Home > MC2 > Chapter 9 > Lesson 9.2.3 > Problem 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. Homework Help ✎

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

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

See (a).

This figure is an obtuse triangle because one of its angles is greater than 90°.

See (a).

Can you explain why this is an acute triangle?

See (a).