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Find geometry lessons on topics such as lines, triangles, polygons, angles, shapes, and more. Browse by topic or search by keyword, or get help from tutors and other students.
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- Lines. Lines, line segments, and rays: Lines Measuring segments: Lines Parallel and perpendicular: Lines. Points, lines, & planes: Lines Geometric definitions: Lines The golden ratio: Lines.
- Angles. Angle introduction: Angles Measuring angles: Angles Constructing angles: Angles Angles in circles: Angles. Angle types: Angles Vertical, complementary, and supplementary angles: Angles Angles between intersecting lines: Angles Sal's old angle videos: Angles.
- Shapes. Properties of shapes: Shapes Equal parts of shapes: Shapes Classifying geometric shapes: Shapes. Curves and polygons: Shapes Angles with polygons: Shapes Geometric solids (3D shapes): Shapes.
- Triangles. Triangle types: Triangles Triangle angles: Triangles Triangle inequality theorem: Triangles Perpendicular bisectors: Triangles. Angle bisectors: Triangles Medians & centroids: Triangles Altitudes: Triangles Bringing it all together: Triangles.
Learn how to solve geometry problems with step-by-step explanations and examples. Find topics such as triangles, circles, perimeter, area, and more on this blog by Ido Sarig.
- Popular Topics in Geometry
- Introduction to Geometry
- Angles
- Triangles
- Polygons
- Circles
- Circle Theorems
- Solid Geometry
- Geometric Formulas
- Coordinate Geometry and Graphs
- GeneratedCaptionsTabForHeroSec
Examples, solutions, and videos have been included in almost all the following topics to help reinforceyour understanding.
Geometry TermsBasic Geometry Terms Points, Lines, Collinear, Line Segments, Midpoints, Rays, Planes, Coplanar, Space Pairs of Lines Intersecting Lines, Parallel Lines, Perpendicular Lines, Skew Lines
Introduction To AnglesAngles How to Name an Angle. Angles Around a Point. Measuring Angles How to use a protractor to measure an angle. Drawing Angles How to use a protractor to draw different type...Types Of AnglesTypes of Angles Right Angles, Acute Angles, Obtuse Angles, Straight Angles, Reflex Angles and Full Angles Pairs of Angles Complementary, Supplementary, Vertical, Corresponding, Alter...Types Of TrianglesTypes of Triangles Right, Acute, Obtuse, Equilateral, Equiangular, Isosceles, Scalene. Oblique Triangles Triangles Right, Acute, Obtuse Triangles Equilateral, Isosceles, Scalene S...Pythagorean TheoremPythagorean Theorem How to use the Pythagorean Theorem, Converse of the Pythagorean Theorem, Worksheets, Pythagorean Theorem Proofs Pythagorean Triples Examples of Pythagorean Tr...Congruent & Similar TrianglesCongruent Triangles SSS rule, SAS rule, AAA rule, AAS rule, HL rule for congruent triangles, CPCTC SSS rule, SAS rule, ASA rule, AAS rule Explain the rules, How to use...Triangle TheoremsTriangle Inequality Triangle Inequality Theorem, Angle-Side Relationship Triangle Sum Theorem Proof of the Triangle Sum Theorem. How to use the Theorem to solve geometry problems i...Introduction To PolygonsPolygons Types of Polygons:simple or complex, convex or concave, equilateral,equiangular, regular or irregular, Naming Polygons Angles in Polygons Sum of Anglesin a Triangle...Area & Perimeter Of PolygonsArea of Polygons Formulas for the area of Square, Rectangle, Parallelogram, Triangle, Rhombus, Kite, Trapezoid, any Regular Polygon Area of Squares and Rectangles Formul...Parts Of A CircleCircles Diameter, chord, radius, arc, semicircle, minor arc, major arc, tangent, secant, circumference, area, sector Parts of a circle Diameter, Chord, Radius, Arc, Tangent, Inters...Area & Circumference Of CircleCircumference of circle Find pi, Formula for circumference of circle, Find circumference, Find radius, diameter and area whengiven circumference Arc of a Circle Arc of...Tangents Of Circles[Tangent to a Circle Point of Tangency, Tangent to a Circle Theorem, Secant, Two-Tangent Theorem, Common Internaland External Tangents Angles, Tangents & Circles Find angles invo...Degrees & RadiansDegrees and Radians Measure angles in degrees, minutes and seconds, Convert to decimal notation, Add and subtractangles, Measure angles in radians, Convert between degrees and radi...Chords & Intercepted ArcsChords of a Circle Perpendicular bisector of a chord passes through the center of a circle, Congruent chords areequidistant from the center of a circle, If two chords in a...Angles In A CircleThe Inscribed Angle Theorem Inscribed angles and central angles, The Inscribed Angle Theorem or The Central Angle Theorem orThe Arrow Theorem. The Bow Theorem Inscribed angles sub...Volume Of SolidsVolume of Cubes What is volume, how to find the volume of a cube, how to solve word problems about cubes, netsof a cube. Volume of Rectangular Prisms How to find the volume of a rec...Surface Area Of SolidsSurface Area of a Cube How to calculate the surface area of a cube, how to find the length of a cube given thesurface area, nets of a cube. Surface Area of a Cuboid How to cal...Area, Surface Area, Volume FormulasArea Formula: Gives the area formula for square, rectangle, parallelogram. rhombus, triangle, regular polygon,trapezoid (trapezium), circle and ellipse. Surface A...
Coordinate PlaneCoordinate Geometry Coordinate plane, Slope Formula, Equation of a Line, Slopes of parallel lines, Slope ofperpendicular lines, Midpoint Formula, Distance Formula Coordinate Plane T...Equation Of A LineSlope of a Line Slope of line from the graph (rise over run), using the slope formula, negative slope, y-intercept Equation of a Line The slope-intercept form for the equation of...Graphs Of Linear EquationsGraphing Linear Equations How to graph linear equations by plotting points, how to graph linear equations by findingthe x-intercept and y-intercept, how to graph linear eq...Midpoint & Distance FormulasMidpoint Formula The midpoint formula, how to find the midpoint given two endpoints, how to find one endpointgiven the midpoint and another endpoint, how to proof the mi...Learn the basic terms and concepts of geometry and practice with problems and worksheets. Find videos, examples, solutions, and formulas for angles, triangles, polygons, circles, solids, coordinate geometry, and more.
Learn about geometry, the study of shapes and their properties. Explore plane and solid geometry, angles, polygons, circles, conic sections, transformations, symmetry, tessellations, coordinates and more with interactive tools and examples.
Geometry Help – Tutoring and Homeschooling. MathHelp.com provides customized Geometry help. Whether you need tutoring on a specific lesson or a comprehensive homeschool curriculum, we have your online Geometry solution. Start now by selecting the button below! START HOMESCHOOLING. Show more.
IXL offers hundreds of Geometry skills to explore and learn, from logic and angles to polygons and transformations. Find a skill that looks interesting, or select a skill plan that aligns to your textbook, state standards, or standardized test.
