Arunner sprints around a circular track of radius 100 m at a constant speed of 7 mys. the runner’s friend is standing at a distance 200 m from the center of the track. how fast is the distance between the friends changing when the distance between them is 200 m?

Step-by-step explanation:

Let B represents the position of runner, A represents the position of the friend and C represents the position of centre of the circular track. ( shown  below ),

We need to find :

By the cosine law,

Differentiating with respect to t ( time ),

Now, by arc length formula,

Radius( say r ) × angle = arc length ( say l )

Differentiating w. r. t. t,

Here,

,

Now, again

We know that,

From equation (1), (2) and (3),

Hence, the distance between the friends changing with the rate of meter per sec.

no association

step-by-step explanation:

if you have eyes and you can use them efficiently you can see that it just looks like random dots like do a line of best fit and like they're so spread out it's such a weak association you might as well consider it nonexistent

what is the question? i am guessing you are looking for the area.

to find an area, you have to do length x width.

in this case, it would be 12 ft x 4 ft = 48 sq. ft