Complete the paragraph proof you can use a similar triangles formed by the altitude to write ratios for corresponding sides. Using ratios from large and medium triangles, C/A=__.This can be written as__=a^2. using ratios from the large and small triangles,__=B/E. This can be written as B^2= EC. By substitution A^2+B^2=___. You can then factor as A^2+B^2=C(F+E). From the large triangle you know (F+E)=__. So, A^2+B^2=C^2. By using substitution.