The statement cannot be proven because it is not true (or incomplete).
A median of a triangle is a line or segment that passes through a vertex and bisects the side of the triangle opposite the vertex.
If you mean which triangle has at least two lines of symmetry, I can answer your question: an equilateral triangle has three lines of symmetry-- one passing through the center of each side and through the opposite point, perpendicular to the side.
It depends on the angle of the plane of the cross section. If it is parallel to the cube's face (or equivalently, two adjacent edges) the cross section will be a square congruent to the face. If the plane is parallel to just one edge (and so angled to a face), the cross section will be a rectangle which will have a constant width. Its length will increase, remain at a maximum level and then decrease. If neither, it will be a hexagon-triangle-hexagon-triangle-hexagon (triangles when passing through a vertex).
A line that bisects a circle and goes through the center of it is the diameter.
In general 'to bisect' something means to cut it into two equal parts. The 'bisector' is the thing doing the cutting.In an angle bisector, it is a line passing through the vertex of the angle that cuts it into two equal smaller angles.Therefore it's in the definition.
A median of a triangle is a line or segment that passes through a vertex and bisects the side of the triangle opposite the vertex.
side
A median of a triangle is a line or segment that passes through a vertex and the midpoint of the side opposite that vertex. The median only bisects the vertex angle from which it is drawn when it is an isosceles triangle.
Parallel to the principal axis
a lens such that a parallel beam of light passing through it is caused to diverge or spread out
5 A
Given a triangle and a line, if the line passes through two sides of the triangle parallel to the third side, then it cuts the sides proportionally.l
If you mean which triangle has at least two lines of symmetry, I can answer your question: an equilateral triangle has three lines of symmetry-- one passing through the center of each side and through the opposite point, perpendicular to the side.
If you mean: y = -x-3 passing through point of (-1, 3) Then the equation of the parallel line is: y =-x+2
vector
A parallelogram has adjacent equal sides. Diagonals of a parallelogram bisect each other,Opposite sides of a parallelogram are parallel and will never intersect. The area of a parallelogram is twice the area of a triangle created by one of its diagonals. Any line through the midpoint of a parallelogram bisects the area.
If you mean: y = 6x-4 then the parallel equation is y = 6x+10