Answer:
x=6
Step-by-step explanation:
(×+54)+5×=90
6×+54=90
90-54
6×=36
×=6
Answer: C. He can show that the measures of arcs AB, AC, and BC are all equal to 120°.
Step-by-step explanation:
Each angle of an equilateral triangle measures 60°, so by the inscribed angle theorem, each arc created by a pair of adjacent vertices will measure 120°.
