Helpful Websites for Geometry

A Little Bit of Everything...

Definitions, Examples, and Key Points by Topic- http://www.mathopenref.com/

Additional Videos and Practice Problems- https://www.khanacademy.org/math/geometry

Online Graphing Calculator- https://www.desmos.com/

https://www.geogebra.org/calculator

Notes and Examples by Topic- https://www.asu.edu/courses/mat142ej/geometry/Geometry.pdf

Practice Quizzes/Tests and Practice

http://www.classzone.com/books/geometry/lessonquiz_national.cfm

https://www.ixl.com/math/geometry

PARCC Practice Test- https://parcc.pearson.com/resources/Practice-Tests/TBAD/Geo/PC1105806_GeoTB_PT.pdf

PARCC Practice Test Answers- https://parcc.pearson.com/resources/Practice-Tests/AKD/Geo/PARCC_Math_-_Geo_Spring_2016_Paper_Practice_Test_Answer_Doc.pdf

Vocabulary (More than You'll Ever Need)

http://www.mathwords.com/index_geometry.htm

http://www.mathopenref.com/

Constructions

https://www.mathsisfun.com/geometry/constructions.html

https://www.mathopenref.com/constructions.html

Parallel Lines

Parallel Lines and Transversal Angles- http://www.mathopenref.com/anglesalternateinterior.html

Parallel Lines and Proving Parallel Lines- https://www.mathsisfun.com/geometry/parallel-lines.html

Solving for x with Two Expressions- includes videos and practice problems on the side bar-

https://www.khanacademy.org/math/algebra/one-variable-linear-equations/alg1-variables-on-both-sides/v/equations-3

Coordinates

Coordinate Geometry (Points and Lines)- http://www.mathopenref.com/tocs/coordpointstoc.html

Slope, Equations of Lines, and Lines Parallel or Perpendicular to Line Through Point (click either parallel or perpendicular)-

http://www.mathopenref.com/tocs/lineartoc.html

https://courses.lumenlearning.com/precalcone/chapter/write-the-equation-of-a-line-parallel-or-perpendicular-to-a-given-line/

Midpoint- https://www.mathsisfun.com/algebra/line-midpoint.html

Distance Between 2 Points-

https://www.mathsisfun.com/algebra/distance-2-points.html

Pythagorean Theorem http://www.mathsisfun.com/pythagoras.html

Quadrilaterals and Triangles

Quadrilaterals

http://www.mathsisfun.com/quadrilaterals.html

https://calcworkshop.com/quadrilaterals/quadrilateral-properties/

https://calcworkshop.com/quadrilaterals/properties-parallelograms/

https://calcworkshop.com/quadrilaterals/prove-parallelogram/

https://calcworkshop.com/quadrilaterals/special-parallelograms/

https://calcworkshop.com/quadrilaterals/trapezoid-properties/

Triangles

Classification, Interior Angles, Exterior Angles, Triangle Inequality, Area, ...- https://www.mathopenref.com/tocs/triangletoc.html

Classification and Area- https://www.mathsisfun.com/triangle.html

Triangle Inequality Theorem- https://www.mathwarehouse.com/geometry/triangles/triangle-inequality-theorem-rule-explained.php

Pythagorean Theorem- https://www.mathsisfun.com/pythagoras.html

Pythagorean Theorem Proof- https://www.youtube.com/watch?v=BNCj-K2hd_k&feature=emb_logo

Triangle Theorems Videos- https://www.brightstorm.com/math/geometry/triangles/

Congruence

Corresponding Parts of Congruent Triangles- http://virtualnerd.com/middle-math/geometric-figures/congruent-similar/triangle-corresponding-parts-example

Congruence-

https://www.mathopenref.com/tocs/congruencetoc.html

http://virtualnerd.com/middle-math/geometric-figures/congruent-similar/congruent-definition

https://www.mathopenref.com/congruentpolygons.html

Congruent Triangles Review- https://www.khanacademy.org/math/geometry/hs-geo-congruence/hs-geo-triangle-congruence/a/triangle-congruence-review

Congruent Triangles Practice- https://www.khanacademy.org/math/geometry/hs-geo-congruence/hs-geo-triangle-congruence/e/congruent_triangles_1

Constructing Triangle Congruence: SSS, SAS, and ASA (HONORS)-

https://mathbitsnotebook.com/Geometry/Constructions/CCconstructSSS.html

Transformations

Reflection and Rotation Rules- http://ewh330.waynecountyschools.org/UserFiles/Servers/Server_43873/File/Directory/Class%20Pages/Pollock,%20Jonathan/Math%20II/Rules%20for%20Reflections%20and%20Rotations.pdf

https://mathbitsnotebook.com/Geometry/Transformations/TRTransformationReflection.html

https://mathbitsnotebook.com/Geometry/Transformations/TRTransformationRotations.html

Transformations Flash Cards- https://quizlet.com/148365664/geometry-transformation-rules-flash-cards/

Translations- https://mathbitsnotebook.com/Geometry/Transformations/TRTransformationTranslations.html

Rotations with Tracing Paper on Coordinate Plane- https://www.youtube.com/watch?v=fMU2lDrp76E

Reflections with Tracing Paper on Coordinate Plane-

https://www.youtube.com/watch?v=rVGRoaO5i1g&t=64s

Translations on a Plane (Honors)- https://www.youtube.com/watch?v=h4wtLsu3nFw

Rotations on a Plane (Honors)-

https://www.youtube.com/watch?v=f5WjvyuyL4o&t=294s

https://www.youtube.com/watch?v=lfbNHsNXEUc&t=412s

Locating the Line of Reflection (Honors)-

https://www.youtube.com/watch?v=-5LwoNPR-54

https://www.youtube.com/watch?v=Ioa4vzwfqUM

Reflections on a Plane (Honors)- https://www.youtube.com/watch?v=AdDO291hp18

Locating the Center of Rotation (Honors)- https://www.youtube.com/watch?v=RsuHN8-kCWo

Triangle Proofs (Congruence)

Proofs Intro- https://www.brightstorm.com/math/geometry/triangles/two-column-proofs/

Proofs Tips- https://initiaeducation.com/6-steps-to-solve-any-geometry-proof-easily/

Triangle Proofs Examples- https://www.youtube.com/watch?v=FSJX0EMCZM0

Triangle Proofs (CPCTC)- https://www.youtube.com/watch?v=lyB4J9FC1ck

Solving for Variables with Similarity- https://www.youtube.com/watch?v=PsVLU5JFH0k

Dilations- https://mathbitsnotebook.com/Geometry/Similarity/SMdilation.html

Dilations- https://mathbitsnotebook.com/Algebra1/FunctionGraphs/FNGTransformationDilation.html

Constructing Dilations (Honors)-

http://www.charleston.k12.il.us/cms/Teachers/math/PreAlgebra/paunit2/L2-1.PDF

Triangle Proofs (Similarity)

https://mathbitsnotebook.com/Geometry/Similarity/SMProofs.html

http://geo2010.blogspot.com/2012/01/64-and-65-prove-triangles-by-aa-sss-and_18.html

Perimeter and Area Ratios of Similar Figures

http://www.onemathematicalcat.org/Math/Geometry_obj/per_area_similar_figures.htm

http://virtualnerd.com/geometry/length-area/perimeter-similar-figures/similar-figures-area-polygon

https://www.ck12.org/geometry/area-and-perimeter-of-similar-polygons/lesson/Area-and-Perimeter-of-Similar-Polygons-BSC-GEOM/

https://www.ck12.org/assessment/ui/?test/view/practice/geometry/Area-and-Perimeter-of-Similar-Polygons-Practice&collectionHandle=geometry&collectionCreatorID=3&conceptCollectionHandle=geometry-::-area-and-perimeter-of-similar-polygons&referrer=practice_badge&ep=https://www.ck12.org/geometry/area-and-perimeter-of-similar-polygons/lesson/Area-and-Perimeter-of-Similar-Polygons-BSC-GEOM/

Trigonometry

Trigonometry Introduction- https://www.mathsisfun.com/algebra/trigonometry.html

Trigonometry Ratios: SohCahToa- http://www.mathopenref.com/sohcahtoa.html

Solving Angles using Trigonometry- http://www.mathopenref.com/triginverse.html

Solving Problems using Trigonometry- http://www.mathopenref.com/trigsolving.html

Solving Sides using Trigonometry Example- http://www.mathopenref.com/trigprobslant.html

Solving Angles using Trigonometry Example- http://www.mathopenref.com/trigprobslantangle.html

Trigonometry Notes & Worked-Out Examples- https://www.shelovesmath.com/trigonometry/right-triangle-trigonometry/

Angle of Elevation & Depression: https://www.cbsd.org/cms/lib010/PA01916442/Centricity/Domain/2075/Right%20Triangle%20Application%20Notes.pdf

If you do not have a calculator, please watch these videos to help you do trigonometry on your phone. (iPhone format is backwards)

Sides: https://www.youtube.com/watch?v=iGyY4gXWcKs

Angles: https://www.youtube.com/watch?v=RgBi-vUqY5s

Surface Area and Volume Ratios

https://www.youtube.com/watch?v=msKLXIjDDwg

https://www.youtube.com/watch?v=SGpxsyOP-rc

Cross Sections and Rotations

Cross Sections of 3-D shapes- https://www.geogebra.org/m/XCZwsytr

Rotating 2-D Shapes to Make 3-D Shapes- https://www.geogebra.org/m/UMHXAvhb

Solid Geometry

http://www.mathopenref.com/tocs/solidtoc.html

Surface Area and Volume Examples- https://www.shmoop.com/surface-area-volume/examples.html

Volume Formulas- https://flexbooks.ck12.org/cbook/ck-12-interactive-geometry-for-ccss/section/1.10/primary/lesson/volume-of-solids-geo-ccss

Circles

Circle Definitions and Theorems- http://web.cerritos.edu/dford/SitePages/Math_70_F13/CircleDefinitionsandTheorems.pdf

Circle Formulas- https://mathbitsnotebook.com/Geometry/Circles/CRAngles.html

Circle Equations- http://www.mathsisfun.com/algebra/circle-equations.html

Area of a Sector- https://www.mathopenref.com/arcsectorarea.html

Arc Length- https://www.mathopenref.com/arclength.html

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