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What is Properties of triangles ??

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Triangle properties Vertex The vertex is a corner of the triangle. Every triangle has three vertices. Base 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. Commonly used as a reference side for calculating the area of the triangle. In an isosceles triangle, the base is usually taken to be the unequal side. Altitude The altitude of a triangle is the perpendicular from the base to the opposite vertex. (The base may need to be extended). Since there are three possible bases, there are also three possible altitudes. The three altitudes intersect at a single point, called the orthocenter of the triangle. See Orthocenter of a Triangle. In the figure above, you can see one possible base and its corresponding altitude displayed. Median 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. See Centroid of a Triangle Perimeter The distance around the triangle. The sum of its sides. See Perimeter of a Triangle Interior angles The three angles on the inside of the triangle at each vertex. See Interior angles of a triangle Exterior angles The angle between a side of a triangle and the extension of an adjacent side. See Exterior angles of a triangle Also: The shortest side is always opposite the smallest interior angle The longest side is always opposite the largest interior angle
is there any formula related to it
Infact, there are lots of formulas..

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please post it for me... only the formulas
Heron's formula, half-base-height formula are the most important area formula.
\[\rm Area = \sqrt{☺(☺-a)(☺-b)(☺ - c)} \]where\[\rm ☺ = {a + b + c\over 2}\] Heron's formula ^
\[\rm {1 \over 2}bh = Area\]
\[\rm s_1 + s_2 + s_3 = perimeter\]
Oh, and that formula in coordinate geometry for area. Search it on Google.

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