the area of a circle is 78.5 square feet. what is the circumference select all that apply.
A. 5 (pi symbol) feet
B. 10 (pi symbol) feet
C. 20 (pi symbol) feet
D. 15.7 feet (my answer)
E. 31.4 feet
F. 62.8 feet
2 answers
i meant E is my answer sorry
area = 78.5 = πr^2
r^2 = 78.5/π
r = √(78.5/π) = appr. 4.9987
C = 2πr = appr 9.9975π , I see 10π which would be a choice
= appr 31.4079.., I see 31.4, which would be another choice,
so I would say B and E
r^2 = 78.5/π
r = √(78.5/π) = appr. 4.9987
C = 2πr = appr 9.9975π , I see 10π which would be a choice
= appr 31.4079.., I see 31.4, which would be another choice,
so I would say B and E
7 answers