A scalene triangle with angles of 50°, 60° and 70° is an acute-angled triangle. An isosceles triangle with angles of 90°, 45° and 45° is a right-angled triangle. This is the only combination ...

It categorizes triangles into equilateral, isosceles, scalene, obtuse, right, and acute based on their sides and angles. The video also covers the concept of congruency, demonstrating how two ...

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 ...