This is a scalene triangle. All the sides are different lengths and each angle is different as well. This one’s a right angled triangle, where one angle is always a right angle, so that's 90 ...

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 ...

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 ...