No. A trinagle does not require four points, three are sufficient. And any three points, if they are not colinear, must be coplanar.
A polygon, but only if all the line segments are coplanar.
A triangle.
triangle
A triangle.
Triangle: A figure formed by exactly three (non-colinear) points joined by line segments is a triangle. A figure formed by three or more points is generally called a polygon. Of course, if all of the points are co-linear then there is not much of a figure. A polygon has 3 or more sides.
It is a plane figure, for example, a semicircle, a triangle, a kite.
A polygon, but only if all the line segments are coplanar.
a polygon.
A triangle.
Polygon
its a triangle
triangle
a triangle
False.
A triangle.
triangle * * * * * What? Two lines can make an angle, but how can they make a triangle?
A polygon. A plane is two dimensional, like a coordinate plane or flat drawings on a piece of paper. If you drew three connecting line segments on a piece of paper, you would be left with a triangle. Four lines create a quadrilateral. Five lines could create a pentagon. All of these shapes are examples of polygons. * * * * * Yes, but a sector of a circle is also formed from three coplanar segments: two straight line segments and one curved. And it is very definitely NOT a polygon.