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Right Triangle

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A right triangle is a triangle that has a right angle. The Pythagorean Theorem is a relationship among the sides of a right triangle.

Right triangle is an elementary-school-level concept. It is listed in the California State Standards for Grade 2.

Prerequisites

Right Angle: A right angle is an angle that measures exactly 90 degrees.
Triangle: A triangle is a three-sided (and three-angled) polygon.
Trigonometry: Trigonometry is the study of angles and of the angular relationships of planar and three-dimensional figures.

Classroom Articles on Polygons

  • Decagon
  • Parallelogram
  • Dodecagon
  • Pentagon
  • Equilateral Triangle
  • Polygon
  • Hendecagon
  • Quadrilateral
  • Heptagon
  • Rectangle
  • Hexagon
  • Regular Polygon
  • Isosceles Triangle
  • Square
  • Nonagon
  • Trapezoid
  • Octagon

  • Classroom Articles on Geometry (Up to Elementary-School Level)

  • Acute Angle
  • Parallel
  • Angle
  • Perimeter
  • Area
  • Perpendicular
  • Circle
  • Point
  • Cone
  • Prism
  • Cube
  • Pyramid
  • Cylinder
  • Radius
  • Diameter
  • Sphere
  • Geometric Construction
  • Surface Area
  • Obtuse Angle
  • Volume