Question

• A. 184
• B. 210
• C. 241
• D. 425

Answer 1

Answer:

A. 184

So the intended rule:

$\boxed{\text{Bottom} = \text{Left}^2 - \text{Right}^2}$

For the third figure:

$25^2 - 21^2 = 625 - 441 = 184$

Thus the answer is:

$\boxed{184}$