I did agree because if the radius is doubled the area will be quadrupled and the circumference would also then be doubled.

Step-by-step explanation:
The ratio cosine tell us that
- In a right angled triangle, the cosine of an angle is the side adjacent to the angle divided by the hypotenuse of the triangle.
In other words,

The side adjacent to angle a is 9. The hypotenuse is 41.
So

because we use simple rule of three
2 inches ---------------- 5 miles
20inch -------------- xmiles
x = 100/2
x = 50
Answer:
C
140
Step-by-step explanation:
Hello!
We can write this as a proportion below.

As you can see, 4 is eight times 0.5. Therefore, we can multiply eighteen by eight to get our answer.
18(8)=144
Just to check, we can cross multiply and divide.
72/0.5=144
Therefore, our answer is
144 feet.
I hope this helps!