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 ...

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.