Triangle or not?

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

Question

Three children are talking about whether shapes are triangles or not.
 
 possible triangle
a)  Abdul 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

 possible triangle
b)  Nita 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

  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.