Final answer:
The measure of the exterior angle to angle G is 59.3°.
Step-by-step explanation:
In triangle EFG, the sum of the angles is always 180 degrees. To find the measure of the exterior angle to angle G, we subtract the sum of the two given angles from 180 degrees. So, the exterior angle to angle G is 180° - (84.3° + 36.4°) = 59.3°.