The image is a worksheet question about classifying triangles by their angles. Here's the complete and corrected version based on the given information:

1. Acute - angles whose measure is less than 90° but greater than 0°.
2. A triangle with three acute angles is known as an acute triangle.

The diagram on the right supports this, showing a triangle with all angles being less than 90° (measuring 36°, 72°, and 72°).

Would you like more details on this topic or any related concepts?

Here are some related questions to expand on this topic:

1. What is a right triangle, and how is it different from an acute triangle?
2. What is an obtuse triangle, and how does it differ from other triangles?
3. Can a triangle have more than one obtuse angle? Why or why not?
4. How do you calculate the sum of all angles in any triangle?
5. Can a triangle be classified by both angles and sides?

Tip: Remember, the sum of all internal angles in any triangle is always 180°.