Triangle or not?

This task is about identifying whether some shapes are triangles and what makes them triangles.

Question

Three people are talking about whether shapes are triangles or not.
 
  Tyrone-HS.png     possible triangle
a)  Tyrone says this is not a triangle.
     What do you think?

    • It's a triangle.

    • It's not a triangle.

Explain why you think this.

Question

simone-shoulders.png         possible triangle
b)  Simone says this is not a triangle.
     What do you think?

    • It's a triangle.

    • It's not a triangle.

Explain why you think this.

Question

Arush-shoulders.png  possible triangle
c)  Arush says this is not a triangle.
     What do you think?

    • It's a triangle.

    • It's not a triangle.

Explain why you think this.

Question

d)  Select all the shapes below that are triangles.

    • possible triangle

    • possible triangle

    • possible triangle

    • possible triangle

    • possible triangle

    • possible triangle

    • possible triangle

    •  
      triangle-8b.png

    • possible triangle

Question 1Change answer

possible triangles

e)  Describe how you know a shape is a triangle.