Formula of circle:
C= 2πr
The radius is half of the diameter, so divide 9 by 2
18/2=9
Then plug in 9 as the radius in the formula.
C= 2π(9)
Using you calculator multiply 2 by the symbol "π" and 9
Exact Form is 18π
Decimal Form is 56.54866776...
The correct answer is the first option, 'Two teams, the Tomcats and the Huskies, battled for the city championship', because that is the only example which contains an appositive phrase, 'the Tomcats and the Huskies'.
