Please explain to me how to solve this.

Answer:
65°
Step-by-step explanation:
The angles of a quadrilateral all add up to 360°. When segments EH and FG are congruent, that means angles E and F are congruent and angles H and G are congruent. This also means that adding angles E and G or angles F and H will give you 360 ÷ 2, which is 180. Using this, just do 180 - 115 to get m∠G.
Answer:
65 degrees
Step-by-step explanation:
Angles E and F are equal because sides EH and FG are equal.
This is a quadrilateral (it has 4 sides, 115 degrees each)
Then the sum of the four interior angles must be 360 degrees.
Subtracting (115 + 115) degrees from 360 yields 130 degrees.
The desired angle is half that, or 65 degrees.