It is given that the two figures are similar. This means that mV is equal to mN, mW is equal to mO, and mX is equal to mP. The sum of the angles of a triangle is equal to 180 degrees.
mV + mW + mX = 180
Substituting the known variables and the conditions given in the description of the similar triangles,
44 + mW + 66 = 180
The value of mW in the equation is 70 degrees.