How much fence is needed to enclose a pool with a diameter of 12.5 feet?

 or  

Step-by-step explanation:

we know that

The circumference of a circle is equal to

In this problem we have

substitute

assume

39.27 feet.

Step-by-step explanation:

We are asked to find the fence needed to enclose a pool with a diameter of 12.5 feet.

, where D represents diameter of circle.

Therefore, 39.27 feet of fence is needed to enclose the pool.

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- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."