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# Content Update: Content added to Eureka courses (8th grade, Algebra 1, Algebra 2, Geometry, and Precalculus)

Updated

In November 2022, Khan Academy added new content to select lessons in our Eureka/EngageNY courses. We’ve used existing content from our other math subjects, so it's possible that you've already covered it there. It's also possible that added exercises might adjust your mastery percentage in these courses - here's the maximum drop you could see from this update:

 Course Previous exercise count Current exercise count Maximum mastery percentage drop 8th Grade 124 125 0.8% Algebra 1 174 175 0.6% Geometry 85 91 6.6% Algebra 2 119 126 5.6% Precalculus 104 116 10.3%

Here's a complete list of content that was added. Note that these courses specifically align with Eureka Math, not Eureka Math Squared. Happy learning!

 Subject Content Type Name 8th grade (Eureka Math/EngageNY) Article Volume formulas review 8th grade (Eureka Math/EngageNY) Article Volume of composite figures 8th grade (Eureka Math/EngageNY) Exercise Apply volume of solids 8th grade (Eureka Math/EngageNY) Video Applying volume of solids Algebra 1 (Eureka Math/EngageNY) Exercise Rational equations intro Algebra 1 (Eureka Math/EngageNY) Video Rational equations intro Algebra 2 (Eureka Math/EngageNY) Article Multiplying binomials by polynomials review Algebra 2 (Eureka Math/EngageNY) Article Reciprocal trig ratios Algebra 2 (Eureka Math/EngageNY) Article Simplifying square roots review Algebra 2 (Eureka Math/EngageNY) Exercise Multiply binomials by polynomials: area model Algebra 2 (Eureka Math/EngageNY) Exercise Finding errors in study conclusions Algebra 2 (Eureka Math/EngageNY) Exercise Multiply binomials by polynomials Algebra 2 (Eureka Math/EngageNY) Exercise Simplify square roots (variables) Algebra 2 (Eureka Math/EngageNY) Exercise Conclusions in observational studies versus experiments Algebra 2 (Eureka Math/EngageNY) Exercise Reciprocal trig ratios Algebra 2 (Eureka Math/EngageNY) Exercise Simplify square roots Algebra 2 (Eureka Math/EngageNY) Video Finding reciprocal trig ratios Algebra 2 (Eureka Math/EngageNY) Video Using reciprocal trig ratios Algebra 2 (Eureka Math/EngageNY) Video Introduction to sampling distributions Algebra 2 (Eureka Math/EngageNY) Video Multiplying binomials by polynomials Algebra 2 (Eureka Math/EngageNY) Video Multiplying binomials by polynomials: area model Algebra 2 (Eureka Math/EngageNY) Video Sampling distribution of sample proportion part 1 Algebra 2 (Eureka Math/EngageNY) Video Sampling distribution of sample proportion part 2 Algebra 2 (Eureka Math/EngageNY) Video Simplifying square roots Algebra 2 (Eureka Math/EngageNY) Video Simplifying square roots (variables) Algebra 2 (Eureka Math/EngageNY) Video Statistical significance of experiment Geometry (Eureka Math/EngageNY) Article Cavalieri's principle in 2D Geometry (Eureka Math/EngageNY) Article Cavalieri's principle in 3D Geometry (Eureka Math/EngageNY) Article Volume of a pyramid or cone Geometry (Eureka Math/EngageNY) Exercise Corresponding parts of congruent triangles Geometry (Eureka Math/EngageNY) Exercise Corresponding sides and points Geometry (Eureka Math/EngageNY) Exercise Apply Cavalieri's principle Geometry (Eureka Math/EngageNY) Exercise Relate scale drawings to area Geometry (Eureka Math/EngageNY) Exercise Use related volumes Geometry (Eureka Math/EngageNY) Exercise Volume of prisms and pyramids Geometry (Eureka Math/EngageNY) Video Cavalieri's principle in 3D Geometry (Eureka Math/EngageNY) Video Geometric constructions: triangle-inscribing circle Geometry (Eureka Math/EngageNY) Video Geometric constructions: triangle-circumscribing circle Geometry (Eureka Math/EngageNY) Video Incenter and incircles of a triangle Geometry (Eureka Math/EngageNY) Video Area of a circle intuition Geometry (Eureka Math/EngageNY) Video Proof: Triangle altitudes are concurrent (orthocenter) Geometry (Eureka Math/EngageNY) Video Vertical angles are congruent proof Geometry (Eureka Math/EngageNY) Video Proving triangle medians intersect at a point Geometry (Eureka Math/EngageNY) Video Solving a scale drawing word problem Geometry (Eureka Math/EngageNY) Video Scale factors and area Geometry (Eureka Math/EngageNY) Video Using related volumes Geometry (Eureka Math/EngageNY) Video Volume of pyramids intuition Geometry (Eureka Math/EngageNY) Video Volumes of cones intuition Precalculus (Eureka Math/EngageNY) Article Cavalieri's principle in 2D Precalculus (Eureka Math/EngageNY) Article Cavalieri's principle in 3D Precalculus (Eureka Math/EngageNY) Article Linearity Precalculus (Eureka Math/EngageNY) Article Linear perspective interactive Precalculus (Eureka Math/EngageNY) Article Volume formulas review Precalculus (Eureka Math/EngageNY) Article Volume of a pyramid or cone Precalculus (Eureka Math/EngageNY) Exercise 2D rendering intuition Precalculus (Eureka Math/EngageNY) Exercise Apply Cavalieri's principle Precalculus (Eureka Math/EngageNY) Exercise Exponential model word problems Precalculus (Eureka Math/EngageNY) Exercise Graphically multiply complex numbers Precalculus (Eureka Math/EngageNY) Exercise Parametric ray intuition Precalculus (Eureka Math/EngageNY) Exercise Divide quadratics by linear expressions (with remainders) Precalculus (Eureka Math/EngageNY) Exercise Ray intersection with line Precalculus (Eureka Math/EngageNY) Exercise Ray intersection with plane Precalculus (Eureka Math/EngageNY) Exercise Solve for t Precalculus (Eureka Math/EngageNY) Exercise Use matrices to manipulate data Precalculus (Eureka Math/EngageNY) Exercise Use matrices to represent data Precalculus (Eureka Math/EngageNY) Exercise Use matrices to transform the plane Precalculus (Eureka Math/EngageNY) Video Geometric constructions: circle tangent (example 2) Precalculus (Eureka Math/EngageNY) Video Cavalieri's principle in 3D Precalculus (Eureka Math/EngageNY) Video Geometric constructions: circle tangent Precalculus (Eureka Math/EngageNY) Video Half-life and carbon dating Precalculus (Eureka Math/EngageNY) Video How one-point linear perspective works Precalculus (Eureka Math/EngageNY) Video Multiplying complex numbers graphically example: -1-i Precalculus (Eureka Math/EngageNY) Video Multiplying complex numbers graphically example: -3i Precalculus (Eureka Math/EngageNY) Video Intro to long division of polynomials Precalculus (Eureka Math/EngageNY) Video 1. Ray tracing intuition Precalculus (Eureka Math/EngageNY) Video 2. Parametric form of a ray Precalculus (Eureka Math/EngageNY) Video 3. Calculate intersection point Precalculus (Eureka Math/EngageNY) Video 4. Using the line equation Precalculus (Eureka Math/EngageNY) Video 5. 3D ray tracing part 1 Precalculus (Eureka Math/EngageNY) Video Exponential model word problem: medication dissolve Precalculus (Eureka Math/EngageNY) Video Exponential model word problem: bacteria growth Precalculus (Eureka Math/EngageNY) Video Using matrices to manipulate data: Game show Precalculus (Eureka Math/EngageNY) Video Using matrices to manipulate data: Pet store Precalculus (Eureka Math/EngageNY) Video Using matrices to represent data: Networks Precalculus (Eureka Math/EngageNY) Video Using matrices to represent data: Payoffs Precalculus (Eureka Math/EngageNY) Video Using matrices to transform the plane: Composing matrices Precalculus (Eureka Math/EngageNY) Video Using matrices to transform the plane: Mapping a vector Precalculus (Eureka Math/EngageNY) Video Volume of pyramids intuition Precalculus (Eureka Math/EngageNY) Video Volumes of cones intuition Precalculus (Eureka Math/EngageNY) Video Wave interference