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1. find the circumference of a circle that has radius of 98 meters. use 3.14 for pi.
2. determine the difference in area between circle a and circle b. use 3.14 for pi and round to the nearest tenth.
(picture below)

1: C=615.75m

2: 62.83 meters or 60 meters rounded to the nearest tenth

Step-by-step 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

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.

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

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.