Triangle means 3 angles. No other shape exists and any three angle shape is a triangle
If the shape has three straight lines and no other lines then it has to be a triangle
A triangle Square An equilateral triangle on a sphere that distends 90 degrees (think of a triangle with one corner at the north pole, one corner on the equator at the 0 meridian, and one corner on the equator at 90 degrees longitude. Each corner of this spherical triangle measures 90 degrees.
A two-dimensional shape with three sides is a triangle. A three-dimensional shape with three faces is a cylinder.
Yeah, three of them.
Not all. Only equilateral triangles have. Equilateral triangles have equal sides and 60 degrees on each corner of the triangle. Other triangle need not have equal sides.
"Vertex" is the plane-geometry term for a corner, so a triangle has three, a square (or any other four-sided shape) has four, a pentagon has five, and so on.
If the shape has three straight lines and no other lines then it has to be a triangle
A triangle Square An equilateral triangle on a sphere that distends 90 degrees (think of a triangle with one corner at the north pole, one corner on the equator at the 0 meridian, and one corner on the equator at 90 degrees longitude. Each corner of this spherical triangle measures 90 degrees.
A triangle is the 2D name of a certain shape. A triangle has three sides and, in the case of a right angled triangle, has an angle of 90 degrees in one corner. There are many other names depending on the angles used.
A congruent triangle is a triangle with all its sides being unequal to each other.
A triangle.
An equilateral triangle has three lines of symmetry.
A shape with three and only three sides is a triangle, but it is not possible for a triangle to have three perpendicular sides.
A triangle is a three sided shape.
a triangle
The three lines making up a triangle do not intersect (cross) each other. Two lines join at each corner of the triangle.
A triangle. An equalateral triangle