Which of the following numbers given in options will replace the question mark in the third diagram?

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Logic: (Left Bottom)²+ (Right Bottom)² = Top Number

For 1st Triangle: $$\frac{2^2 + 6^2}{2} = \frac{4 + 36}{2} = \frac{40}{2} = 20$$

For 2nd triangle: $$\frac{3^2 + 5^2}{2} = \frac{9 + 25}{2} = \frac{34}{2} = 17$$​​

Similarly, For 3rd triangle: $$\frac{4^2 + 6^2}{2} = \frac{16 + 36}{2} = \frac{52}{2} = 26$$​​

Therefore, ? = 26

Thus, the correct option is (d) 26