One of the angles obtained by the intersection of the straight lines is 115 degrees. Calculate the remaining angles

Intersecting straight lines form 4 angles at the point of intersection, the sum of which is always 360 °. Opposite angles are equal to each other and are called vertical. This means that the angle opposite to the given angle is also equal to 115 °. The sum of other equal vertical angles is 360 ° – 115 ° – 115 ° = 360 ° – 230 ° = 130 °. Each of these angles is 130/2 = 65 °.
Answer: 115 °, 115 °, 65 °, 65 °.