If all sides different scalene .
if two sides equal isosceles .
if all sides equal equilateral .
ıf all angles acute, acute triangle .
One angle right or obtuse, then right or obtuse triangle.
Some include equilateral but not generally accepted.
Vertices are not considered as parts, they are dimensionless
ob.... .
Half of a square is not necessarily a triangle .
Triangle inequality is pretty important .
Since the sum of inner angles of a triangle is 180 degrees, ... .
Isosceles triangles do have two of their interior angles equal.
In isosceles triangles the inequal angle is usually considered as the vertex angle. The side opposite vertex angle is the base and base angles
are equal .
In right triangles the sides including the right angle are called legs and the (longest) side opposite the right angle is called
hypotenuse .
The ∠B is included by the sides AB and BC .
The side AB is included by ∠A and ∠B .
When a side of a triangle is also a side of another triangle we say the side is common .
Rhombus is an equilateral parallelogram, including the square as a special case. That is, if the angles are also equal, a rhombus is a square.
The triangle isosceles and the vertex angle is 90° .
The column left has 4 unit squares and there are ... columns .
One of the legs is the base of the triangle and the other is the height.
By rectangles the area = side_{short} x side_{long} .
Perimeter is here a restriction on which the question is based .
The sides are kept equal .
all angles are still equal .
Since the opposite angles are equal, opposite sides should be parallel.
Draw all possible triangles of 7 vertices, sum the angles .In general there will be "number of sides - 2" triangles each having a sum of 180°
A reflex angle is greater than 180º and less than 360º.
A perigon (or a revolution) is an angle that equals exactly 360º and is completed with completion of a closed convex figure.
Convex: any line drawn through the polygon (and not tangent to an edge or corner) meets its boundary exactly twice .
Simple: the boundary of the polygon does not cross itself. All convex polygons are simple.
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