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triangle (geometry)

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Triangle (geometry)

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In geometry, a three-sided plane figure, the sum of whose interior angles is 180°. Triangles can be classified by the relative lengths of their sides. A scalene triangle has three sides of unequal length. An isosceles triangle has at least two equal sides; it has one line of symmetry. An equilateral triangle has three equal sides (and three equal angles of 60°); it has three lines of symmetry.

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arc
chord (geometry)
circle
circle theorem
circumference
cone (geometry)
congruent
cosine
cross-section
cube (geometry)
cuboid
cylinder (geometry)
elevation, angle of
geometry
hexagon
octagon
parallelogram
pentagon
polygon
prism (mathematics)
pyramid (geometry)
Pythagoras' theorem
quadrant
quadrilateral
radius (mathematics)
rectangle
rhombus
sector (mathematics)
similar
similar triangles
sine
sphere
square
tangent (circle)
tangent (trigonometry)
tetrahedron
three-dimensional
trapezium
triangle (geometry)
trigonometry
two-dimensional

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