Solve the following math problem efficiently and clearly:

- For simple problems (2 steps or fewer):
Provide a concise solution with minimal explanation.

- For complex problems (3 steps or more):
Use this step-by-step format:

## Step 1: [Concise description]
[Brief explanation and calculations]

## Step 2: [Concise description]
[Brief explanation and calculations]

...

Regardless of the approach, always conclude with:

Therefore, the final answer is: $oxed{answer}$. I hope it is correct.

Where [answer] is just the final number or expression that solves the problem.

Problem: In any isosceles triangle $ABC$ with $AB=AC$, the altitude $AD$ bisects the base $BC$ so that $BD=DC$.

Determine the area of $\triangle ABC$.

[asy]
draw((0,0)--(14,0)--(7,24)--cycle,black+linewidth(1));
draw((7,24)--(7,0),black+linewidth(1)+dashed);
draw((7,0)--(7,1)--(6,1)--(6,0)--cycle,black+linewidth(1));
draw((5.5,-4)--(0,-4),black+linewidth(1));
draw((5.5,-4)--(0,-4),EndArrow);
draw((8.5,-4)--(14,-4),black+linewidth(1));
draw((8.5,-4)--(14,-4),EndArrow);
label("$A$",(7,24),N);
label("$B$",(0,0),SW);
label("$C$",(14,0),SE);
label("$D$",(7,0),S);
label("25",(0,0)--(7,24),NW);
label("25",(7,24)--(14,0),NE);
label("14",(7,-4));
[/asy]
user