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AAA Doesn't work AAA Triangle similarity test AAS Congruent Triangles How to construct a triangle given two angles and a non-included side (AAS) About Math Open Reference Goals and Objectives The fundamental rationale behind Math Open Reference Technical support page Ten Reasons why technology is vital to education Terms of Use Abscissa Coordinates of a point Acceleration - math word definition Calculus - Equations of Motion Calculus - Accumulation Functions Acute Acute triangle definition Acute Angle definition How to add two angles with compass and straightedge or ruler Adjacent Adjacent sides definition Adjacent Angles definition Adjacent arcs definition How advertising on the site works How advertising on the site works How advertising on the site works 24 hour time calculator 24 hour difference between two times calculator Algorithm definition Circle and ellipse drawing algorithm Area of a polygon algorithm Functions as used in programming languages Alternate-angle Alternate Exterior Angles definition Alternate Interior Angles definition Calculus - Alternating Series Test Altitude How to construct (draw) one of the three altitudes of a triangle How to construct (draw) one of the three altitudes of an obtuse triangle Triangle definition and properties Altitude of a triangle Area of a triangle (conventional method) with calculator Orthocenter of a triangle - math word definition Sine waves- math word definition - Trigonometry Calculus - Basic curve analysis Calculus - Curve Analysis - Global Extrema Calculus - Curve analysis - Special cases Biography of Thales - math word definition Angle - Math word definition Acute Angle definition Complementary Angles definition Full Angle - An angle with a measure of 360 deg Included angle definition Interior of an angle definition Obtuse Angle definition Reflex Angle definition Right Angle - math word definition Adjacent Angles definition Alternate Exterior Angles definition Alternate Interior Angles definition Corresponding Angles definition Straight Angle definition Exterior Angles of a Transversal definition Interior Angles of a transversal definition Supplementary Angles definition Vertical Angles definition Angle measure of an arc Central Angle Theorem Arc Peripheral Angle Angle bisector definition Central angle of a circle Inscribed angle of a circle AAA Doesn't work AAS Congruent Triangles Congruent Angles ASA Congruent Triangles How to add two angles with compass and straightedge or ruler How to construct a 30 degree angle with compass and straightedge or ruler How to construct (draw) a 45 degree angle with compass and straightedge or ruler How to construct a 60 degree angle with compass and straightedge or ruler Constructing 75, 105, 120, 135, 150 degree angles and more How to bisect an angle with compass and straightedge or ruler Complementary angle using compass and straightedge or ruler How to copy an angle with compass and straightedge or ruler Difference of two angles using compass and straightedge or ruler Difference of two angles using compass and straightedge or ruler How to use a protractor to draw an angle How to use a protractor to measure angles Supplementary angle using compass and straightedge or ruler Triangle given two angles and the included side (ASA) How to construct (draw) a right triangle with a given one angle and hypotenuse (HA) How to construct a triangle given two sides and the included angle (SAS) Cosine - math word definition Coterminal - math word definition Degrees as a unit of angle measure Angle calculator for angles expressed in Degrees, Minutes, Seconds Angle calculator for angles expressed in Degrees, Minutes, Seconds Exterior-angle Full angle - Math word definition Linear Pair - math word definition Angle calculator for angles as used in the Nautical Almanac Normal - math word definition Interior angles of a parallelogram Interior / exterior angles of a polygon Exterior Angles - math word definition Protractor - math word definition Interior angles of an inscribed quadrilateral Angle Quiz 1 Radian - math word definition Reference angle Intersecting Secant Angles Theorem Angle inscribed in a semicircle The sine function - math word definition Subtended angle definition Area of a triangle (Side-angle-side method) with calculator Triangle exterior angles definition Triangle exterior angle theorem Triangle interior angles definition Relationship of side lengths and angles of a triangle Angle definition and properties (Trigonometry) Trigonometry function with large and negative angles Initial side - math word definition - Trigonometry Quadrantal angle - math word definition - Trigonometry Standard position of an angle definition - Trigonometry The tangent function in right triangles - Trigonometry Terminal side definition - Trigonometry Annulus - Math word definition Area of an annulus Calculus - Antiderivatives from Slope Calculus - Basic Antiderivatives Calculus - Functions defined using integrals Apothem of a polygon Arc - Math word definition Angle measure of an arc Intercepted arc Arc Length definition Major and Minor Arcs Arc Peripheral Angle Radius of an Arc or Arch with calculator - Math Open Reference Derivation of the arc radius formula Adjacent arcs definition Calculus - Arc Length Finding the center of a circle or arc with compass and straightedge or ruler Parts of a circle - Pictorial index Sagitta definition with calculator The inverse trigonometry functions Calculus - Arc Length The trigonometry arccos() function - inverse cosine - math word definition The trigonometry arccos() function - inverse cosine - math word definition Radius of an Arc or Arch with calculator - Math Open Reference The trigonometry arcsin() function - inverse sine - math word definition The trigonometry arcsin() function - inverse sine - math word definition The trigonometry arctan() function - inverse tangent - math word definition The trigonometry arctan() function - inverse tangent - math word definition Area of an annulus Area of a sector of a circle Area Calculus - Areas By Slicing Calculus - Polar Area Area enclosed by a circle with calculator Derivation of the formula for the area of a circle Surface area of a right cone Derivation of the formula for the area of a cone Area of any polygon (Coordinate Geometry) Area of a polygon algorithm Area of a polygon calculator Area and perimeter of a rectangle. (Coordinate Geometry) Area and Perimeter of a Square. (Coordinate Geometry) Trapezoid area and perimeter. (Coordinate Geometry) Area of a triangle (Coordinate Geometry) Area of a triangle using the box method (Coordinate Geometry) Surface area of a cube with calculator Derivation of the surface area of a cylinder Surface area of a cylinder with calculator Area enclosed by an ellipse Area of a triangle given three sides - Heron's Formula with calculator Area of a Kite Area of a parallelogram. Definition and formula Derivation of the formula for the area of a parallelogram Area of an Irregular Polygon Regular polygon area formula Derivation of the formula for the area of a regular polygon Surface area of a prism Surface area of a pyramid Area of an inscribed quadrilateral Area of a rectangle with calculator. Definition and formula Rhombus area formula with calculator Area of a circle segment with calculator- Math Open Reference Area and height of a circle segment with calculator- Math Open Reference Triangle similarity, ratios of area Surface area of a sphere Area of a square and calculator. Definition and formula Surface area of 3D solid shapes with formula and links to other pages Area of a trapezoid. Definition, formula and calculator Derivation of the formula for the area of a trapezoid Area of a triangle (conventional method) with calculator Relationship of area and perimeter of a triangle Area of a triangle (Side-angle-side method) with calculator Area of an equilateral triangle Arithmetic - math word definition Negative number definition - math word definition Positive number definition - math word definition Quotient Ten Reasons why technology is vital to education Teaching Geometric Constructions using Math Open Reference ASA Congruent Triangles Triangle given two angles and the included side (ASA) About the Author Calculus - Average Value Calculus -Average velocity and speed Axis, axes - Math word definition Print blank graph paper Introduction to Coordinate Geometry and the Cartesian Plane The Coordinate Plane Cylinder definition and properties Cylinder as the locus of a line Relation of a cylinder to a prism Major / minor axis of an ellipse Semi-major / semi-minor axis of an ellipse X-axis definition Y-axis definition