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A triangle is a polygon with three corners and three sides, one of the basic shapes in geometry. The corners, also called vertices, are zero-dimensional points while the sides connecting them, also called edges, are one-dimensional line segments. The triangle's interior is a two-dimensional region.
A triangle has three sides and three angles ... The three angles always add to 180 ... There are three special names given to triangles that tell how many sides (or angles) are
Properties of a Triangle. The sum of all three interior angles of a triangle is always equal to 180⁰. The sum of the length of any two sides of a triangle is always greater than the length of the third side. The area of a triangle is equal to half of the product of its base and height.
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A triangle is a 3-sided closed shape. There are two important formulas related to triangles, i.e., the Heron's formula and Pythagoras theorem. The sum of the interior angles of a triangle is 180° and is expressed as ∠1 + ∠2 + ∠3 = 180°. ☛Related Articles.
Geometry (all content) 17 units · 180 skills. Unit 1 Lines. Unit 2 Angles. Unit 3 Shapes. Unit 4 Triangles. Unit 5 Quadrilaterals. Unit 6 Coordinate plane. Unit 7 Area and perimeter. Unit 8 Volume and surface area.