Oh a triangulator machine! Very cool! Right, there are four different types of triangle. First, here's an isosceles triangle, it has two equal length sides and two equal angles. Oh! Very clever!

to build on students' knowledge of triangle ... in proposing definitions of other mathematical concepts (e.g., quadrilaterals) to highlight inclusive relations between triangles (e.g., recognizing ...

A scalene triangle has 3 sides of different lengths and 3 unequal angles. An isosceles triangle has 2 sides of equal length. The dashes on the lines show they are equal in length. The angles at ...