Grade 10Analytical Geometry
there are 10 points on a plane.4 of them are collinear find the number of quadrilaterals possible
there are 10 points on a plane.
4 of them are collinear
find the number of quadrilaterals possible
1 Answer
Nayak Roshan
You can solve this problem by using combinations that is nCr= n (factorial)/(n-r)factorial ×r(factorial) here n= number of points=10. And r= number of points required to form a quadrilateral=4. There by putting it in the formula you get that 210 quadrilateral s can be formed but in the question it is given that 4 points are Collinear so that Collinear are points cannot form a quadrilateral . Due to this number of quadrilaterals formed is 210-1=219....
HOPE THIS HELPED YOU.....
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