For example, a triangle translates 3 squares to the right and then 4 squares downward: according to the method of graphic translation, the three vertices of the triangle translate 3 squares to the right, then translate 4 squares downward, and then connect them in turn to get the translated figure.

Theorem of triangle interior angle sum: the triangle interior angle sum is equal to 180. Expressed by mathematical symbols: in △ABC, ∠ 1+∠ 2+∠ 3 = 180. It can also be expressed as _ △ ABC, ∠ 1+∠ 2+∠ 3 = 180.