Question

If Z1 Z2, then mZ1 = m_2abreflexive properydefinition of congruencedefinition of anglessymmetric propertyC

Answer 1

If,

$\angle1\cong\angle2$

Means that both of the angles are being almost the same.

translated as the measurements of the angles must be the same

$m\angle1=m\angle2$

Means that everything is the same, if everything is the same when being overlapsed between them it will be the same.

This is known as the definition of congruence.

answer: c