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 ...

to build on students' knowledge of triangle and develop students' reasoning with properties of different classes of triangles to develop students' language related to the formal geometric names of ...

Image caption, All three sides of an equilateral ... acute-angled triangle. A scalene triangle with angles of 50°, 60° and 70° is an acute-angled triangle. An isosceles triangle with angles ...