A simple guide on how to show the angles in triangle add up to 180 degrees, aimed at students aged 11 to 14. ... Triangles up to 180 degrees slideshow. Image gallery Skip image gallery.

This argument can be generalized to show that any three angle measures that sum to 180 degrees can make a triangle, and one immediate consequence is that it’s easy to find triangles whose angle ...

Past this point and all further angles are known as reflex angles (181-360 degrees). ... (0-180 degrees - pictured above ) ... where as an obtuse triangle will have one angle greater than 90 degrees.