We're provided - m FBD = ( 2x + 3 ) ° & m EBC = ( 9x - 11 ) ° and We're asked to find m EBC .
Do you know what vertically opposite angles are ? - When two lines intersect , the angles formed opposite to each other are called vertically opposite angles. Vertically opposite angles [ VOA ] are always equal to each other.
The length of the diagonal of the container is the square root of length squared plus width squared plus height squared. This is then, solving, we get x = 4, or x = -26/3