Answer:
33°
Explanation:
Complementary angles are two angles that, when added together, result in a 90° angle.
If we know the measure of one of these angles, we can easily find the measure of the other. Let's assume x is the missing angle length.
![57 + x = 90](https://img.qammunity.org/2021/formulas/mathematics/high-school/udv3k8xvbbto6qhoyqgtgj1h2r6kxo5sh7.png)
![x = 90-57\\\\x = 33](https://img.qammunity.org/2021/formulas/mathematics/high-school/odz8hyroy0k3wt2roi2lboeg0ik4qp7wfz.png)
So x is 33°.
Hope this helped!