In the following diagram, $O$ is the center of the circle. If three angles $\alpha, \beta$ and $\gamma$ be equal, find $\alpha.$
[asy]
unitsize(40);
import graph; size(300); real lsf = 0.5; pen dp = linewidth(0.7) + fontsize(10); defaultpen(dp); pen ds = black; pen ttttff = rgb(0.2,0.2,1); pen ffttww = rgb(1,0.2,0.4); pen qqwuqq = rgb(0,0.39,0);
draw(circle((0,0),2.33),ttttff+linewidth(2.8pt)); draw((-1.95,-1.27)--(0.64,2.24),ffttww+linewidth(2pt)); draw((0.64,2.24)--(1.67,-1.63),ffttww+linewidth(2pt)); draw((-1.95,-1.27)--(1.06,0.67),ffttww+linewidth(2pt)); draw((1.67,-1.63)--(-0.6,0.56),ffttww+linewidth(2pt)); draw((-0.6,0.56)--(1.06,0.67),ffttww+linewidth(2pt)); pair parametricplot0_cus(real t){
return (0.6*cos(t)+0.64,0.6*sin(t)+2.24);
}
draw(graph(parametricplot0_cus,-2.2073069497794027,-1.3111498158746024)--(0.64,2.24)--cycle,qqwuqq); pair parametricplot1_cus(real t){
return (0.6*cos(t)+-0.6,0.6*sin(t)+0.56);
}
draw(graph(parametricplot1_cus,0.06654165390165974,0.9342857038103908)--(-0.6,0.56)--cycle,qqwuqq); pair parametricplot2_cus(real t){
return (0.6*cos(t)+-0.6,0.6*sin(t)+0.56);
}
draw(graph(parametricplot2_cus,-0.766242589858673,0.06654165390165967)--(-0.6,0.56)--cycle,qqwuqq);
dot((0,0),ds); label("$O$", (-0.2,-0.38), NE*lsf); dot((0.64,2.24),ds); label("$A$", (0.72,2.36), NE*lsf); dot((-1.95,-1.27),ds); label("$B$", (-2.2,-1.58), NE*lsf); dot((1.67,-1.63),ds); label("$C$", (1.78,-1.96), NE*lsf); dot((1.06,0.67),ds); label("$E$", (1.14,0.78), NE*lsf); dot((-0.6,0.56),ds); label("$D$", (-0.92,0.7), NE*lsf); label("$\alpha$", (0.48,1.38),NE*lsf); label("$\beta$", (-0.02,0.94),NE*lsf); label("$\gamma$", (0.04,0.22),NE*lsf); clip((-8.84,-9.24)--(-8.84,8)--(11.64,8)--(11.64,-9.24)--cycle);
[/asy]
1. **Identify the given information and the goal:**
   - We are given a circle with center \( O \).
   - Three angles \(\alpha\), \(\beta\), and \(\gamma\) are equal.
   - We need to find the value of \(\alpha\).

2. **Understand the geometric configuration:**
   - Since \(O\) is the center of the circle, \(OA\), \(OB\), and \(OC\) are radii of the circle.
   - The angles \(\alpha\), \(\beta\), and \(\gamma\) are inscribed angles subtended by arcs of the circle.

3. **Use the property of inscribed angles:**
   - The measure of an inscribed angle is half the measure of the central angle that subtends the same arc.
   - Therefore, if \(\alpha\), \(\beta\), and \(\gamma\) are inscribed angles, the central angles subtending these arcs are \(2\alpha\), \(2\beta\), and \(2\gamma\) respectively.

4. **Since \(\alpha = \beta = \gamma\), let’s denote this common angle as \(\alpha\):**
   - The central angles subtending these arcs are \(2\alpha\), \(2\alpha\), and \(2\alpha\).

5. **Sum of the central angles around point \(O\):**
   - The sum of the central angles around a point is \(360^\circ\).
   - Therefore, \(2\alpha + 2\alpha + 2\alpha = 360^\circ\).

6. **Solve for \(\alpha\):**
   \[
   6\alpha = 360^\circ
   \]
   \[
   \alpha = \frac{360^\circ}{6}
   \]
   \[
   \alpha = 60^\circ
   \]

The final answer is \(\boxed{60^\circ}\).