There is only one property used to determine whether
.
The property is called the distributive property and in a nutshell it states, , which means
is distributed through
using multiplication. So
says, distribute
to
and
which then translates into
.
It is given that the triangles ITH and APG are congruent.
When the two triangles are congruent, then the corresponding angles and sides are congruent to each other.
By being congruent, the corresponding angles which are congruent are:
Therefore,
SO, Option 2 is the correct answer.