Illustrative Mathematics
Equilateral Triangle - Definition, Examples, Formulas
plane, plane shapes ~ A Maths Dictionary for Kids Quick Reference
Dividing a Right Triangle by the Altitude to the Hypotenuse
Plane geometry, Plane figures, Right-angled triangle, Equilateral and isosceles triangle
Elementary plane geometry : inductive and deductive / by Alfred
Plane Geometry Properties and Relations of Plane Figures - ppt
Plane Geometry Properties and Relations of Plane Figures - ppt
Lesson Explainer: Isosceles Triangle Theorems
Plane figures, Triangles, Types of Triangles, Main Properties of
Area of a Triangle and a Quadrilateral: Formulas and Solved Example
Plane Geometry - ISEE Upper Level Math