I will give brainlest so hurry and points 20
And please show your work

1.    =  15ft

2.   = 7mi

Step-by-step explanation:

1. The radius of the circle is half of the diameter.

30/2 = 15 ft

The radius is 7 ft

2. The diameter of the circle is double the radius.

3.5 x 2 = 7

The radius is 7 ft.

3. When given the diameter, the circumference of the circle is

3.14 x diameter

3.14 x 20 = 62.8

The circumference of the circle is 62.8 ft.

4. When given the radius, the circumference of the circle is

2 x 3.14 x radius

2 x 3.14 x 7 = 43.96

The circumference of the circle is 43.94 feet.

5. I don’t know this. Sorry.

6. I don’t know this. Sorry.

7. When given the diameter, the area of the circle is

1/2 x radius x circumference

1/2 x 10 x 62.8 = 314

The area of the circle is 314 ft.

8. When given the radius, the area of the circle is

3.14 x radius^2

3.14 x 7^2 = 153.86

The area of the circle is 153.86 ft.

9. I don’t know this. Sorry.

10. I don’t know this. Sorry.

pls mark brainliest if this helped :)