Khan Academy
Khan Academy: Geometry: Ca Geometry: More Proofs
Demonstrates solutions to problems #7-10 of California Geometry released state test questions. Problems address understanding of congruent angle pairs when parallel lines are cut by a transversal, counterexamples, and properties of the...
Khan Academy
Khan Academy: Geometry: Proof Sum of Measures of Angles in a Triangle Are 180
Proof that the sum of the angles in a triangle is 180 using the relationship of angles formed when parallel lines are cut by a transversal. This video also appears in the Geometry: Triangles strand. [6:31]
Khan Academy
Khan Academy: Ca Geometry: Basic Trigonometry
Demonstrates solutions to problems #61-65 of California Geometry released state test questions. Problems address the equation of a circle, basic trigonometry. [11:04]
Khan Academy
Khan Academy: Geometry: Right Triangles Inscribed in Circles (Proof)
This video tutorial [5:35] explains that if the diameter of a circle is one of the sides of a triangle inscribed in the circle then the triangle is a right triangle. This video also appears in the strand Geometry: Circles.
Khan Academy
Khan Academy: Geometry: Problem Involving Angle Derived From Square and Circle
Demonstrates how to solve a challenging geometry problem about finding the measure of an angle that is formed by different segments in a square which intersect with part of a circle. Solution depends on creating triangles in the diagram...
Khan Academy
Khan Academy: Geometry: Inradius Perimeter and Area
Proof that the area of a triangle is equal to half the inradius times the perimeter of the triangle, or the area is equal to the inradius times the semiperimeter. This video also appears in the Geometry: Circles strand. [7:29]
Khan Academy
Khan Academy: Geometry: More on Why Ssa Is Not a Postulate
Explains why SSA is not a valid postulate for proving triangle congruence. Practice problems available. This video [7:24] also appears in the Geometry: Triangles strand.
Khan Academy
Khan Academy: Geometry: Triangle Angle Example 3
Explains how to solve for multiple missing angles in a diagram composed of multiple triangles using the triangle sum theorem and other angle relationships. This video also appears in the Geometry: Triangles strand. [5:42]
Khan Academy
Khan Academy: Geometry: 2003 Aime Ii Problem 7
Explanation of 2003 AIME II (American Invitational Mathematics Examination) Problem 7. Finding the area of a rhombus based on the circumradii of triangles. This video also appears in the Geometry: Polygons, quadrilaterals, and...
Loyola University Chicago
Math Flix: Extended Response: Area Rectangle Explanation
This video [6:10] works through a geometry problem using area and perimeter. This real world problem will require an extended response. The teacher and student discuss how to work through it together to find the solution. As you watch...
Other
Math Counts Foundation: Probability With Geometry Representations
This video focuses on probability with geometry representations. Links to an activity sheet and the solutions also available.
Loyola University Chicago
Math Flix: Extended Response: Make Rectangle Solution 2
This QuickTime movie continues working through a geometry problem using area and perimeter. This real world problem will require an extended response. The teacher and student discuss how to work through it together to find the solution....
Loyola University Chicago
Math Flix: Extended Response: Make Rectangle Solution 1
This QuickTime movie works through a geometry problem using area and perimeter. This real world problem will require an extended response. The teacher and student discuss how to work through it together to find the solution. As you watch...
Loyola University Chicago
Math Flix: Extended Response: Make Rectangle Explanation
This QuickTime movie continues working through a geometry problem using area and perimeter. This real world problem will require an extended response. The teacher and student discuss how to work through it together to find the solution....
Khan Academy
Khan Academy: Euclid as the Father of Geometry
Euclid was a great mathematician and often called the father of geometry. Learn more about Euclid and how some of our math concepts came about and how influential they have become.
Loyola University Chicago
Math Flix: Extended Response: Area Rectangles Solution
This video [3:23] works through a geometry problem using area and perimeter. This problem, in the form of a riddle, will require an extended response. As you watch and listen to the teacher and student interact it helps clarify the...
Khan Academy
Khan Academy: Geometry: Perimeter and Area of a Non Standard Polygon
Explains how to find the perimeter and area of a non-standard, or irregular polygon. [3:03] CCSS.Math.Content.3.MD.C.7.d Recognize area as additive.
Sophia Learning
Sophia: Coordinate Geometry of Parallelograms
This lesson will demonstrate how to use slope, midpoint, and distance formulas to determine from the coordinates of the vertices if a quadrilateral is a parallelogram in a coordinate plane. Students can check their understanding with an...
Planet Nutshell
Planet Nutshell: Math Shorts: Translation
Planet Nutshell Math Shorts provide animated videos that explain various math topics. On this site students learn about translations.
Planet Nutshell
Planet Nutshell: Math Shorts: Reflection
Planet Nutshell Math Shorts provide animated videos that explain various math topics. On this site students learn about reflections.
Planet Nutshell
Planet Nutshell: Math Shorts: Dilations
Planet Nutshell Math Shorts provide animated videos that explain various math topics. On this site, students learn about dilations.
Planet Nutshell
Planet Nutshell: Math Shorts: Rotation
An animated video that explains rotations in transformational geometry. [1:44]
Khan Academy
Khan Academy: Geometry: Parts of a Circle
Identifies and labels basic parts of a circle: center, diameter, radius, and circumference. This video also appears in the Geometry: Circles strand. [2:01]
Khan Academy
Khan Academy: Geometry: Triangle Angle Example 2
Shows how to find the measure of missing angles using the triangle sum theorem and vertical angles. This video also appears in the Geometry: Triangles strand. [4:55]
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