Answer: 1. C=43.96 in A=153.86 in²
2. C=56.52 in A=254.34 in²
Explanation:
1.
R=7 in
C=2πR
C=2*3.14*7
C=43.96 in
A=πR²
A=3.14*7²
A=3.14*7*7
A=153,86 in²
2.
R
D=18 in
⇒ R=D/2
⇒ R=18/2
⇒ R=9 in
C=2πR
C=2*3.14*9
C=56.52 in
A=πR²
A=3.14*9²
A=3.14*9*9
A=254.34 in²