Answer:
1. r = 5 cm; area = 78.5 sq. cm.
2. diameter, d = 17'; area = 226.98 sq. ft.
3. diameter, d = 11"; area = 95.0 sq. in
4. radius, r = 2.4 m; area = 18.1 sq. m
5. radius, r = 30'; area = 2827.4 sq. m
Explanation:
Area = pi * r^2
pi = 3.1416
1. radius, r = 5 cm
area = pi*5^2 = 78.5 sq. cm.
2. diameter, d = 17'
radius, r = d/2 = 8.5'
area = pi * 8.5^2 = 226.98 sq. ft.
3. diameter, d = 11"
radius, r = 11/2 = 5.5"
area = pi * 5.5^2 = 95.0 sq. in
4. radius, r = 2.4 m
area = pi * 2.4^2
= 18.1 sq. m
5. radius, r = 30'
area = pi 30^2
= 2827.4 sq. m