Solution

159153

Problem
Triangle or No Triangle? Back to problem
First name
Nawaf Salih
School
Pimlico primary
Country
England
Age
7

1,2,3,4,5 are triangles
6,7,8,9,10 are not triangles

A triangle has 3 edges and 3 verticesThe ones that are not triangles because
one is curved and not straight lines. The
next triangle has a gap in it.The one after that is not a triangle because it has
4 edges.The last one is not a triangle
because the vertices are not pointy.