The radius of circle f is 19 cm.
what is the length of its diameter?
a.
9.5 cm
b.
19 cm
c.
21 cm
d.
38 cm

The diameter of the circle F is 38 cm .

Option (D) is correct .

Step-by-step explanation:

As given

The radius of the circle F is 19 cm.

Definition of diameter

Diameter is defined as the distance fom one point of the circle passing through centre of circle to another point .

Diameter = 2 × Radius

                = 2 × 19 cm

                = 38 cm

Therefore the diameter of the circle F is 38 cm .

Option (D) is correct .

- "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."

they disappear if your absent from to long. i found out that the hard way.

step-by-step explanation:

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