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20: abc, abd, abe, abf, acd, ace, acf, ade, adf, aef, bcd, bce, bcf, bde, bdf, bef, cde, cdf, cef, def.

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Q: How many triangles can be formed using six points on a plane no three of which are on the same straight line?
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Related questions

There are nine points in a plane. No three points are in the same straight line. How many different triangles can be formed by using the nine points as vertices?

84


Given n points in the plane you draw all possible triangles whose vertices are any three of the given points Atleast how many of them are obtuse-angled triangles?

The least number of obtuse triangles, if all possible triangles are drawn for n points in a plane, is zero. If all the n points lie in a straight line, no triangles are possible and so no obtuse triangles are able to be drawn; thus for any number n, there is a possibility that no obtuse triangles can be drawn, so the least possible number of obtuse triangles drawn is zero.


What is the locus of points in a plane that are equidistant from points A and B in the plane?

a straight line ..


If a cube intersects a plane what possible figures can be formed?

Quadrilaterals and triangles.


How are triangles and quadrilaterals related?

They are closed plane figures bounded by straight lines.


Is a line joining two points not necessarily in the plane containing the two points?

If it is a straight line it must be in the same plane. Otherwise not necessarily.


What is the locus of points in a plane that are equidistant from two fixed points?

I believe that is the definition of a straight line.


Can a isoceles triangle be a polygon?

A polygon is a plane figure bounded by a finite number of straight lines. To enclose an area then a minimum of three straight lines are required. All triangles, not just isosceles triangles, are polygons.


A straight line is the shortest distance between?

Two points in a plane.


What is the difference between a plane and an angle?

A plane is a straight line. An angls is formed by 2 intersecting lines.


In geometry is it true that through any three points exists exactly one line?

No, given any three points, it is possible for one of the points not to be on the line defined by the other two points. Only two points on a line are needed to identify the exact position of the line. The positions of any three points gives you the exact position of the plane that includes those three points.No, it is not true. If it were true, all triangles would be straight lines !?!


What are triangles and other polygons made of?

They are made of straight lines, all in one plane, such that pairs of them meet at vertices.