2. Classifying Triangles 3 rd Grade Mathematics Alexis Carroll Click Here to begin the lesson!

3. Click on the following triangles for more information. Triangle Equilateral Isosceles ScaleneTriangleEquilateralIsoscelesScalene Acute Right ObtuseAcuteRightObtuse Click here for the review question

4. Triangle  A triangle has three sides  A triangle has three angles  The three angles always add to 180° Click the arrow to go to the homepage

5. Equilateral Triangle  Three equal sides  The small lines on each side of the triangle indicate the sides are the same length  Three equal angles, always 60°  The angles must be clearly classified Click the arrow to go to the homepage

6. Isosceles Triangle  Two equal sides  The lengths are classified by the small dashes on two sides of the triangle  Two equal angles  Must have two arcs or equal measurements on two of the corners of the triangle Click the arrow to go to the homepage

7. Scalene Triangle  No equal sides  Does not provide the lengths of the side or the dashes on any of the sides of the triangle  No equal angles  Does not provide the angles of the triangle or the arcs Click the arrow to go to the homepage

8. Acute Triangle  All angles are less than 90°  Must show all angles are <90° with labels  The angles will still add up to 180° Click the arrow to go to the homepage

9. Right Triangle  Must have a right angle (90°)  Must box in the corner representing 90°  If there isn’t a box, the triangle must be labeled Click the arrow to go to the homepage

10. Obtuse Triangle  Has an angles more than 90° and less than 180°  Must have one angle >90° Click the arrow to go to the homepage

11. What type of triangle is the following? A. Equilateral Triangle B. Scalene Triangle C. Right Isosceles Triangle D. Obtuse Triangle

12. Try Again!! An equilateral triangle has three equal sides and three equal angles. Click the arrow to go back to the question

13. Try Again!! A scalene triangle has no equal sides and no equal angles. Click the arrow to go back to the question

14. Way To Go!!! You are correct! A right isosceles triangle has two equal sides and a 90° angle. Click the arrow to move forward

15. Try Again!! An obtuse triangle has an angle greater than 90°. >90° Click the arrow to go back to the question

16. Congratulations you have completed the lesson! Click on the following image to go back to the home page!