To use the Trigonometry, we need... A) A right triangle with 2 known angles & 1 side B) A right triangle with 1 known side and 1 known angle C) A right triangle with 2 known angles D) A right triangle with 2 known sides

B

Step-by-step explanation:

You use the side oppo the angle and the side that is labelled in trigonometry

- "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."

yes

step-by-step explanation:

yes