how many sides does each triangle
and cut them into equal parts
To find the mid point you must
x = (x1 + x2) / 2
y = (y1 + y2) / 2
(3,2.5)
In order to make

a mixed number you have to do division.

. Check:

. Therefore,

as a mixed number is

. Hoped I helped. :)
The answer is 100 degrees.