Answer:
1: C=615.75m
2: 62.83 meters or 60 meters rounded to the nearest tenth
Explanation:
1: The circumference of a circle that has radius of 98 meters, using 3.14 for pi, is 615.75m.
Formula: C=2πr
C=2πr=2·π·98≈615.75216m
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2: The difference in area between circle A and circle B, using 3.14 for pi and rounded to the nearest tenth is 62.83 meters or 60 meters.
Circle A:
The diameter of circle A is 12 cm.
Changing the diameter to radius is going to be easier.
Radius is half of the diameter.
12 ÷ 2 = 6
Therefore, the area of circle A is 113.1.
Formula: A=πr^2
A=πr^2=π·6^2≈113.09734
Circle B:
The diameter of circle B is 8 cm.
Once again, changing the diameter to radius is going to be easier.
Radius is half of the diameter.
8 ÷ 2 = 4
Therefore, the area of circle B is 50.27.
Formula: A=πr^2
A=πr2=π·42≈50.26548
113.09734 - 50.26548 = 62.83 meters or 60 meters.