Let $A$, $B$, and $C$ be distinct points on a line with $AB=AC=1$. Square $ABDE$ and equilateral triangle $ACF$ are drawn on the same side of line $BC$. What is the degree measure of the acute angle formed by lines $EC$ and $BF$?

[i]Ray Li[/i]
1. **Identify the coordinates of points \(A\), \(B\), and \(C\)**:
   - Let \(A\) be at the origin, i.e., \(A = (0, 0)\).
   - Since \(AB = 1\) and \(AC = 1\), and \(B\) and \(C\) are on the same line, we can place \(B\) at \((1, 0)\) and \(C\) at \((-1, 0)\).

2. **Determine the coordinates of points \(D\) and \(E\) in square \(ABDE\)**:
   - Since \(ABDE\) is a square with side length 1, and it is drawn on the same side of line \(BC\), point \(D\) will be at \((1, 1)\) and point \(E\) will be at \((0, 1)\).

3. **Determine the coordinates of point \(F\) in equilateral triangle \(ACF\)**:
   - Since \(ACF\) is an equilateral triangle with side length 1, and it is drawn on the same side of line \(BC\), point \(F\) will be at \(\left(-\frac{1}{2}, \frac{\sqrt{3}}{2}\right)\).

4. **Calculate the slopes of lines \(EC\) and \(BF\)**:
   - The slope of line \(EC\) is given by:
     \[
     \text{slope of } EC = \frac{1 - 0}{0 - (-1)} = 1
     \]
   - The slope of line \(BF\) is given by:
     \[
     \text{slope of } BF = \frac{\frac{\sqrt{3}}{2} - 0}{-\frac{1}{2} - 1} = \frac{\frac{\sqrt{3}}{2}}{-\frac{3}{2}} = -\frac{\sqrt{3}}{3}
     \]

5. **Calculate the angle between lines \(EC\) and \(BF\)**:
   - The angle \(\theta\) between two lines with slopes \(m_1\) and \(m_2\) is given by:
     \[
     \tan(\theta) = \left| \frac{m_1 - m_2}{1 + m_1 m_2} \right|
     \]
   - Substituting \(m_1 = 1\) and \(m_2 = -\frac{\sqrt{3}}{3}\):
     \[
     \tan(\theta) = \left| \frac{1 - \left(-\frac{\sqrt{3}}{3}\right)}{1 + 1 \cdot \left(-\frac{\sqrt{3}}{3}\right)} \right| = \left| \frac{1 + \frac{\sqrt{3}}{3}}{1 - \frac{\sqrt{3}}{3}} \right|
     \]
   - Simplify the expression:
     \[
     \tan(\theta) = \left| \frac{\frac{3 + \sqrt{3}}{3}}{\frac{3 - \sqrt{3}}{3}} \right| = \left| \frac{3 + \sqrt{3}}{3 - \sqrt{3}} \right|
     \]
   - Rationalize the denominator:
     \[
     \tan(\theta) = \left| \frac{(3 + \sqrt{3})(3 + \sqrt{3})}{(3 - \sqrt{3})(3 + \sqrt{3})} \right| = \left| \frac{9 + 6\sqrt{3} + 3}{9 - 3} \right| = \left| \frac{12 + 6\sqrt{3}}{6} \right| = \left| 2 + \sqrt{3} \right|
     \]
   - Since \(\tan(75^\circ) = 2 + \sqrt{3}\), the acute angle formed by lines \(EC\) and \(BF\) is \(75^\circ\).

The final answer is \(\boxed{75^\circ}\).