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Write 30 properties a triangle.(don't give link please)

Properties of triangles:(1) The sum of all the interior angles of a trianle is 180°(2) The sum of any two sides of a triangle is always greater than the third side.(3) The triangle with none of its sides equal is a scalene triangle.(4) The triangle with its two sides equal is an isosceles triangle.(5) The triangle with its all the sides equal is an equilateral triangle.(6) Angles opposite to equal sides of an isosceles triangle are equal.(7) Sides opposite to equal angles of a triangle are equal.(8) In any triangle, the sides opposite to the larger angle is longer.(9) The exterior angle of a triangle is the sum of two opposite interior angles.(10) The triangle with all of its angle less than 90° is an acute triangle.(11) The triangle with one of its angles greater than 90° is an obtuse triangle.(12) The triangle with one of its angle equal to 90° is a right triangle.
(13)  The largest angle would always be the angle opposite to the largest side.
(14) The smallest angle would always be the angle opposite to the smallest side
(15) The altitudes of a triangle meet at a single point which is called "orthocenter" of the triangle.
(16) The medians if a triangle intersect at a single point which is called "circumcenter" of the triangle.
(17) The sum of any two sides of  a triangle is always greater than third side.
(18) The sum of all exterior angles in  a triangle is 360 degrees.
​(19)  Every triangle has three vertices ( Corner of triangle ) .
(20) The base of a triangle can be any one of the three sides, usually the one drawn at the bottom. You can pick any side you like to be the base.
(21) The altitude of a triangle is the perpendicular from the base to the opposite vertex. 
(22) The median of a triangle is a line from a vertex to the midpoint of the opposite side. The three medians intersect at a single point, called the centroid of the triangle.
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