Remember, these are quadrilaterals, so they must add up to 360°. Just add up the angles and then do 360 minus that number to solve for x.
Therefore:
- 118 + 90 + 99 = 307
360 - 307 = 53
- 110 + 96 + 78 = 284
360 - 284 = 76
- 48 + 118 + 97 = 263
360 - 263 = 97
- 105 + 99 + 64 = 268
360 - 268 = 92
- 103 + 63 + 113 = 279
360 - 279 = 81
- 95 + 80 + 88 = 263
360 - 263 = 97
