**Complete the equations to prove that vertical angles always have equal measure.**
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$\text{In terms of } \green v \text{ and a number} \\\text{in degrees,}$ | $\purple w=$ | [[☃ expression 2]]
$\text{In terms of } \green v \text{ and a number} \\\text{in degrees,}$ | $\pink u=$ | [[☃ expression 4]] |
$\text{Combining these equations to } \\ \text{get } \pink u \text{ in terms of } \purple w,$ | $\pink u=$ | [[☃ expression 5]]