Answer: 1 is 102°, 2 is 78° 3 is 102°.
Step-by-step explanation: The street forms vertical angles,. One of the angles are 78, 2 is a vertical angle to 78 so it is also 78.
2 and 1 are supplementary angles, so since 2 is 78°, we subtract 78 from 180.
if we subtract 78 from 180, we get 102, so 1 is 102°.
1 and 3 are vertical angles, so 3 is also 102°.