9. If set A is a subset of set B, and set B is a subset of set C. Is it true that set A is a subset
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Answer:
Step-by-step explanation:
If we drew an auxiliary line parallel to line and line
that intersects the vertex of
, we would form three angles, one of them being
The largest of these angles corresponds with the angle marked as .
The angle on the bottom right corresponds with the angle next to the one marked as . Therefore, its measure is
.
Since there are in a circle, we can now write the following equation:
.