-- If it's a graph of speed/time, then the speed at any instant of time is the 'y' value of the graph at that time.
-- If it's a graph of distance/time, and it's a straight line, then the speed at any time is the slope of that line. If the graph has peaks and valleys and dips in it, then the speed at any time is the slope of a short piece of line that just touches the graph at that time.
(To be very technical, you can never read velocity from a graph, and you can't even draw a graph of velocity. Velocity is a speed and the direction of the speed, and it's almost impossible to combine all of that information in one graph.)
Instantaneous velocity is represented on a position vs. time graph by the slope of the tangent line at a specific point on the curve. This slope indicates the velocity of the object at that moment. For straight lines, velocity remains constant, while for curves, it changes, requiring tangent lines to determine instantaneous values.
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Jawaban:Keliling lingkaran = πd, di mana d adalah diameter. Jika kelilingnya 75 cm, maka: 75 cm = πd d = 75 cm / π d ≈ 23.87 cm Jadi, diameternya kira-kira 23.87 cm.