In a certain triangle $ABC$, there are points $K$ and $M$ on sides $AB$ and $AC$, respectively, such that if $L$ is the intersection of $MB$ and $KC$, then both $AKLM$ and $KBCM$ are cyclic quadrilaterals with the same size circumcircles. Find the measures of the interior angles of triangle $ABC$.
1. Let \( N \) be the intersection point of \( AL \) and \( BC \). Let \( \omega_1 \) and \( \omega_2 \) be the circumcircles of \( AKLM \) and \( KBCM \), respectively.
2. Since \( AKLM \) and \( KBCM \) are cyclic quadrilaterals, we have:
   \[
   \angle LAM = \angle LKM \quad \text{and} \quad \angle MBN = \angle MKN
   \]
   as inscribed angles.
3. This implies that \( ABNM \) is cyclic. Similarly, we can prove that \( AKNC \) is also cyclic.
4. We claim that \( L \) is the orthocenter of \( \triangle ABC \). To prove this, we need to show that \( CK \), \( BM \), and \( AN \) are altitudes.
5. Since \( AKLM \) and \( KBCM \) are cyclic with the same circumcircle, we have:
   \[
   \angle AKM = \angle ACB \quad \text{and} \quad \angle MKC = \angle MBC = \angle NAC
   \]
6. Therefore,
   \[
   \angle AKC = \angle AKM + \angle MKC = \angle ACB + \angle NAC
   \]
7. Similarly,
   \[
   \angle BKC = \angle ACB + \angle MBC = \angle ACB + \angle NAC
   \]
8. Thus,
   \[
   \angle AKC = \angle BKC
   \]
9. Since \( \angle AKC + \angle BKC = 180^\circ \), we have:
   \[
   \angle AKC = \angle BKC = 90^\circ
   \]
   This implies that \( CK \) is an altitude. Similarly, we can prove that \( BM \) and \( AN \) are also altitudes.
10. For the second part of the proof, observe that \( AL \) and \( BC \) are the diameters of \( \omega_1 \) and \( \omega_2 \), so they are equal.
11. Since \( \angle KAN = \angle KCB \) as inscribed angles, and \( \angle AKL = \angle CKB = 90^\circ \), we have:
    \[
    \triangle AKL \cong \triangle CKB
    \]
12. This gives us \( AK = KC \), and since \( \angle BAC = 45^\circ \), the other angles of \( \triangle ABC \) (i.e., \( \angle ABC \) and \( \angle ACB \)) can be chosen arbitrarily, as long as their sum is \( 135^\circ \).

The final answer is \( \boxed{ \angle BAC = 45^\circ } \) and the sum of \( \angle ABC \) and \( \angle ACB \) is \( 135^\circ \).