Given △ABC∼△DEF , m∠A=52° , and m∠E=11° , what is the measure of angle C ?

1 answer

Since triangles \( \triangle ABC \) and \( \triangle DEF \) are similar, their corresponding angles are equal. This means:

\[ m\angle A = m\angle D, \] \[ m\angle B = m\angle E, \] \[ m\angle C = m\angle F. \]

We know that:

\[ m\angle A = 52^\circ, \] \[ m\angle E = 11^\circ. \]

To find \( m\angle B \):

\[ m\angle B = m\angle E = 11^\circ. \]

Now, we can find \( m\angle C \). The sum of the angles in a triangle is \( 180^\circ \). Therefore, for triangle \( ABC \):

\[ m\angle A + m\angle B + m\angle C = 180^\circ. \]

Substituting the known values:

\[ 52^\circ + 11^\circ + m\angle C = 180^\circ. \]

Adding the angles we have:

\[ 63^\circ + m\angle C = 180^\circ. \]

Now, we can solve for \( m\angle C \):

\[ m\angle C = 180^\circ - 63^\circ = 117^\circ. \]

Thus, the measure of angle \( C \) is

\[ \boxed{117^\circ}. \]