A triangle is a polygon. It is a closed 3-sided shape made up of straight lines. The ‘tri-’ part of the word triangle means three. A triangle has 3 sides and 3 angles. Interior angles are the ...

Learn about the different types of quadrilaterals and their properties. Types of triangle Find out about scalene, equilateral, isosceles and right-angled triangles. Identifying 2D shapes Find out ...

Now, more than 122 years after it was first proposed, Kamata and two other mathematicians have finally proved that a solution ...

Shape sorters have been around for centuries and have evolved into many different forms, all with the same general concept. They consist of some sort of container with indented or perforated slots ...