An isosceles triangle with angles of 100°, 40° and 40° is an obtuse-angled triangle. Image caption, A scalene triangle with one angle greater than 90° is an obtuse-angled triangle. A scalene ...

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 ...

Scalene triangle. A scalene triangle is ... then it is easy to calculate the third remaining angle. Obtuse-angled triangle. An obtuse-angled triangle is a triangle that has one obtuse angle.