1. How can you classify these different triangles?

2. In this lesson you will learn how to classify triangles by observing their angles.

3. Let’s Review An angle is a figure made from two rays that have the same endpoint. Angle

4. Angles are given special names depending on their size. Right ObtuseAcute Straight

5. A triangle is a polygon with three sides and three angles.

6. Core Lesson We can classify and sort triangles by the types of angles that make them up. Acute TrianglesRight TrianglesObtuse Triangles G

7. Right triangles are triangles with one right angle and two acute angles.

8. Acute triangles are triangles with all acute angles.

9. Obtuse triangles are triangles with one obtuse angle and two acute angles.

10. Sorting by angle types. Right TrianglesAcute TrianglesObtuse Triangles

11. What type of triangle is formed on the inside of these stairs? Right Triangle

12. What type of triangle is this slice of pizza ? Acute Triangle

13. What type of triangle is the roof of this house? Obtuse Triangle

14. Acute TriangleObtuse TriangleRight Triangle How can you classify these different triangles?

15. In this lesson you have learned how to classify triangles by observing their angles.