It cannot be an equilateral triangle because that would have 60º angles for all three angles, so none could be 90º. All right-angled triangles are either isosceles or scalene. If you look ...

Properties of symmetry: - Students may notice symmetry in the isosceles and equilateral triangles and non-symmetry in the scalene triangles Informal recognition of these properties may be helpful in ...

Big Idea – We can describe, measure, and compare spatial relationships. to build on students' knowledge of triangle and develop students' reasoning with properties of different classes of triangles to ...