Angles

We can write this as an equation, getting:

$45^\circ+45^\circ+x+45^\circ+2x=180^\circ$

$135^\circ+3x=180^\circ$

$3x=45^\circ$

$x=15^\circ$

We can now add $2x$ to $45^\circ$ and get:

$30^\circ+45^\circ$

$75^\circ$

We get that angle $C=75^\circ$

Answer: 75°