There are 16 possible triangles.
1op2*11+11p2*10
84
2 lines, I believe.
the median is drawn from the vertex to the midpoint of the opposite side
A chord is a straight line drawn through a circle which divides the circle into two parts. The line can be drawn anywhere in the circle EXCEPT the center where it becomes the diameter.
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.
1op2*11+11p2*10
i think just one line, as its defenition of straight line
If the points are collinear, that means there's only one straight line. An infinite number of different planes can be drawn that contain one straight line.
line segments
84
A straight line segment can be drawn joining any two points.
Yes, it is true that a line can be drawn through any two distinct points in a two-dimensional plane. This is a fundamental concept in geometry, as two points uniquely determine a straight line. If the points are the same, they do not define a line but rather a single point.
2 lines, I believe.
Through any two fixed points, exactly one distinct line can be drawn. This is a fundamental principle in geometry, as two points uniquely determine a straight line. No other line can pass through both points, ensuring the uniqueness of the line connecting them.
Angles on a straight line add up to 180 degrees.
1 straight line. An infinite number of curved lines.