$\overleftrightarrow{AE}$ and $\overleftrightarrow{BD}$ are parallel lines. The interior angles of a triangle sum to $180^\circ$. **Complete the equations to prove that corresponding angles always have equal measure.**  ||| - | -: | - $\text{In terms of } \purple w \text{ and a number} \\\text{in degrees,}$ | $\green v=$ | [[☃ expression 1]] $\text{In terms of } \purple w \text{ and a number} \\\text{in degrees,}$ | $\pink u=$ | [[☃ expression 2]] | $\text{Combining these equations to } \\ \text{get } \green v \text{ in terms of } \pink u,$ | $\green v=$ | [[☃ expression 4]]