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Line & angle proofs

MK\overleftrightarrow{MK} and NJ\overleftrightarrow{NJ} are parallel lines.
The interior angles of a triangle sum to 180180^\circ.
Complete the equations to prove that corresponding angles always have equal measure.
In terms of c and a numberin degrees,\text{In terms of } \purple c \text{ and a number} \\\text{in degrees,}b=\green b=
In terms of c and a numberin degrees,\text{In terms of } \purple c \text{ and a number} \\\text{in degrees,}a=\pink a=
Combining these equations to get b in terms of a,\text{Combining these equations to } \\ \text{get } \green b \text{ in terms of } \pink a,b=\green b=