Answer: Last Option
50°
Explanation:
For this case we know the R and S angles of the comet.
Note in the image that the UR and US sides are congruent, and the UT and ST sides are congruent.
Therefore the angle U is equal to the angle S
![S = U = 100\°](https://img.qammunity.org/2020/formulas/mathematics/middle-school/akjlbubhahib8pbxkraipn1g4gkicavyj4.png)
Finally, the sum of the interior angles of a quadrilateral is equal to 360 °.
This is:
![S + R + U + T = 360\°\\\\100+ 110 +100 + T = 360\\\\](https://img.qammunity.org/2020/formulas/mathematics/middle-school/m0ncic3hsqssfxl8sv6pvebmv1uc7bgjwz.png)
Now we solve the equation for T
![T = 360-100-110-100\\\\T = 50\°](https://img.qammunity.org/2020/formulas/mathematics/middle-school/uci7i8un7vk3f9q7is3xtomo2436h40jx9.png)