Interior angles in a triangle add up to 180 ... The techniques used are useful for solving all kinds of other geometry problems too. There are two rules to remember. First, when a diagonal ...

If the triangles are congruent and each geometric figure has interior angles of equal measure, you can write the following pairs: In geometry, the following congruent angles theorems dictates the ...

It may be useful to refer to M1 properties of angles; M1 properties of 2D shapes and M5 Polygons if necessary. The sum of the angles inside any polygon can be found by spitting the polygon into ...