Classifying triangles
Name: _____________________ Date: __________
Show your thinking with numbers, words, or a drawing.
1. Is this triangle equilateral, isosceles or scalene?
2. Is this triangle equilateral, isosceles or scalene?
3. Is this triangle equilateral, isosceles or scalene?
4. Is this triangle equilateral, isosceles or scalene?
5. Is this triangle equilateral, isosceles or scalene?
Answer key ยท Classifying triangles
1. scalene
Look at the tick marks: sides with the same marks are the same length.
Each side has a different mark, so no two sides are equal.
It is a scalene triangle.
2. scalene
Look at the tick marks: sides with the same marks are the same length.
Each side has a different mark, so no two sides are equal.
It is a scalene triangle.
3. scalene
Look at the tick marks: sides with the same marks are the same length.
Each side has a different mark, so no two sides are equal.
It is a scalene triangle.
4. isosceles
Look at the tick marks: sides with the same marks are the same length.
Two sides have the same mark, so exactly two sides are equal.
It is an isosceles triangle.
5. equilateral
Look at the tick marks: sides with the same marks are the same length.
All three sides have the same mark, so all three sides are equal.
It is an equilateral triangle.
Try it together
Choose a question from the printable. Use objects or a drawing to show your thinking, then explain your method to someone at home.