Reward points: 5- 14 days and 23 hours before the end of the problem.
The eighth grade first volume exercise book P 10 the first 10 answer.
Question supplement: People's Education Publishing House, eighth grade mathematics exercise book, Volume I, P 10, the answer to question 10.
Take sides AB and AC of triangle ABC as sides, make square ABDE and square ACFG outward respectively, and connect EG. Prove that the areas of triangle ABC and triangle AEG are equal?