1. The problem is to find the missing number in the expression $$\square \times \square = \square$$ where the known numbers connected are 5 and 7. 2. Since the two numbers 5 and 7 are connected to the top rectangle, it suggests the missing number is related to these two. 3. The multiplication symbol $\times$ indicates the operation between the first and second squares. 4. The equation can be interpreted as $$5 \times 7 = ?$$ 5. Calculate the product: $$5 \times 7 = 35$$ 6. Therefore, the missing number in the third square is $$35$$. 7. Final answer: $$35$$.