### Instruction: In parallelogram $ABCD$, angle $B$ measures $110^\circ$. What is the number of degrees in the measure of angle $C$?### Response: I know that opposite angles in a parallelogram are equal, so angle $B$ and angle $D$ are both $110^\circ$.
I also know that the sum of the angles in a quadrilateral is $360^\circ$.
So, if I add up the four angles of the parallelogram, I get $2 \times 110 + 2 \times C = 360$.
Simplifying, I get $220 + 2 \times C = 360$.
Subtracting $220$ from both sides, I get $2 \times C = 140$.
Dividing both sides by $2$, I get $C = 70$.
So, the measure of angle $C$ is $70^\circ$.