Ms. Klein wants to put a fence around her garden. The garden is in the shape
of a semi-circle with a radius of 12 feet. How much fence does Ms. Klein need
to buy for her garden?

A: 37.68 feet
B: 61.68 feet
C: 75.36 feet
D: 99.36 feet

b i think

step-by-step explanation:

not really sure

- "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."