In mathematics, triangle means: A flat shape with three straight sides and three angles; the angles inside any triangle always add up to 180 degrees.
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How it is used
Triangles are classified by their sides as equilateral (all equal), isosceles (two equal) or scalene (none equal), and by their angles as right, acute or obtuse. They are named by their vertices, as in 'triangle ABC'.
Example sentences
Triangle ABC is isosceles, with AB equal to AC.
Split the shape into two triangles and add their areas.
Common collocations
right triangle
isosceles triangle
equilateral triangle
area of a triangle
similar triangles
Related terms
angleThe amount of turn between two lines or rays that meet at a point, measured in degrees or radians.
hypotenuseThe longest side of a right triangle, which is the side opposite the right angle.
Pythagorean theoremThe rule that in a right triangle the square of the hypotenuse equals the sum of the squares of the other two sides: a² + b² = c².
congruentExactly the same shape and size, so that one figure fits perfectly on top of the other, possibly after being turned or flipped over.
similarHaving exactly the same shape but not necessarily the same size, so that corresponding angles are equal and corresponding sides are in the same ratio.
