How many chords can be drawn through 21 points on a circle?
Given: 21 points on a circle
We know that we require two points on the circle to draw a chord
∴ Number of chords is:
⇒ 21C2= 
∴ Total number of chords can be drawn are 210
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How many chords can be drawn through 21 points on a circle?
Given: 21 points on a circle
We know that we require two points on the circle to draw a chord
∴ Number of chords is:
⇒ 21C2=
∴ Total number of chords can be drawn are 210