Complete the following theorem statements
1. A line parallel to one side of a triangle divides the other two sides ..
2. If two triangles are ..., then their corresponding sides are in proportion
3.If two triangles have their corresponding sides ..., then the triangles are equiangular
4. The theorem of ... can be proved using similar triangles.
1. A line parallel to one side of a triangle divides the other two sides proportionally.
2. If two triangles are similar, then their corresponding sides are in proportion.
3. If two triangles have their corresponding sides in proportion, then the triangles are similar.
4. The theorem of Pythagoras can be proved using similar triangles.