Let $\theta = \angle BAM.$  Then $\angle BDM = 3 \theta.$  Since $\angle BDM$ is external to triangle $ABD,$ $\angle BDM = \angle BAD + \angle ABD.$  Hence, $\angle ABD = \angle BDM - \angle BAD = 2 \theta.$

By the Law of Sines on triangle $ABD,$
\[\frac{BD}{\sin \theta} = \frac{AD}{\sin 2 \theta}.\]Then
\[\frac{BD}{\sin \theta} = \frac{10}{2 \sin \theta \cos \theta} = \frac{5}{\sin \theta \cos \theta},\]so $\cos \theta = \frac{5}{BD}.$

Then
\[AB = \frac{AM}{\cos \theta} = \frac{11}{5/BD} = \frac{11}{5} BD.\]By the Pythagorean Theorem on right triangles $AMB$ and $DMB,$
\begin{align*}
BM^2 + 11^2 &= AB^2, \\
BM^2 + 1^2 &= BD^2.
\end{align*}Subtracting these equations, we get
\[AB^2 - BD^2 = 120.\]Then
\[\frac{121}{25} BD^2 - BD^2 = 120,\]so $BD = \frac{5 \sqrt{5}}{2}.$  Then $AB = \frac{11 \sqrt{5}}{2},$ and $BM = \frac{11}{2}.$  Therefore, the perimeter of triangle $ABC$ is
\[AB + AC + BC = \frac{11}{2} \sqrt{5} + \frac{11}{2} \sqrt{5} + 11 = \boxed{11 \sqrt{5} + 11}.\]
Question:
Triangle $ABC$ is isosceles, with $AB=AC$ and altitude $AM=11.$ Suppose that there is a point $D$ on $\overline{AM}$ with $AD=10$ and $\angle BDC=3\angle BAC.$  Find the perimeter of triangle $ABC.$

[asy]
unitsize(0.4 cm);

pair A, B, C, D, M;

A = (0,11);
D = (0,1);
B = (-11/2,0);
C = (11/2,0);
M = (B + C)/2;

draw(A--B--C--cycle);
draw(A--M);
draw(B--D--C);

label("$A$", A, N);
label("$B$", B, SW);
label("$C$", C, SE);
label("$D$", D, NW);
label("$M$", M, S);
[/asy]
Answer:
Let's think step by step.

user
11 \sqrt{5} + 11
Triangle $ABC$ is isosceles, with $AB=AC$ and altitude $AM=11.$ Suppose that there is a point $D$ on $\overline{AM}$ with $AD=10$ and $\angle BDC=3\angle BAC.$  Find the perimeter of triangle $ABC.$

[asy]
unitsize(0.4 cm);

pair A, B, C, D, M;

A = (0,11);
D = (0,1);
B = (-11/2,0);
C = (11/2,0);
M = (B + C)/2;

draw(A--B--C--cycle);
draw(A--M);
draw(B--D--C);

label("$A$", A, N);
label("$B$", B, SW);
label("$C$", C, SE);
label("$D$", D, NW);
label("$M$", M, S);
[/asy]
test