triangle corners add up to 180
The corner angles of a triangle
always add up to a straight line
The corner angles of a triangle always make a straight line,
no matter what kind of triangle it is. Angles on a straight
line always add up to 180º, so the corner angles of a
triangle must always add up to 180º, too.
This is true for
you could possibly
Try it with any
shape of triangle—
fat, thin, big, small....
20 Chapter 1