Mathematics
- Algebra I →Suggested: Grades 9–10
- Geometry →Suggested: Grades 9–11
- Algebra II →Suggested: Grades 10–12
- Precalculus and Trigonometry →Suggested: Grades 11–12
- Statistics and Probability →Suggested: Grades 10–12
High School Curriculum Explorer · Grades 9–12
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138 original mini-lessons with video choices23 courses9 subject areas
Suggested pathways · Selected standards contributions · No calculus
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Each course has six lessons in three suggested units. Grade ranges guide placement; they are not universal requirements.
English language arts
- English 9 →Suggested: Grade 9
- English 10 →Suggested: Grade 10
- English 11 →Suggested: Grade 11
- English 12 →Suggested: Grade 12
Science
- Biology →Suggested: Grades 9–10
- Chemistry →Suggested: Grades 10–11
- Physics — Algebra and Trigonometry →Suggested: Grades 11–12
- Earth and Environmental Science →Suggested: Grades 9–12
Social studies
- World History →Suggested: Grades 9–10
- United States History →Suggested: Grades 10–11
- Civics and Government →Suggested: Grades 11–12
- Economics and Personal Finance →Suggested: Grades 11–12
Visual arts
- Visual Arts →Suggested: Grades 9–12
Music
- Music →Suggested: Grades 9–12
Health and physical education
- Health and Physical Education →Suggested: Grades 9–12
Computer science and digital literacy
- Computer Science and Digital Literacy →Suggested: Grades 9–12
World languages
- Spanish I →Suggested: Grades 9–12
- Spanish II →Suggested: Grades 10–12
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2 matching lessons
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Precalculus and Trigonometry
Suggested grades 11–12 · Unit 3: Periodic models and finite sequences
A Sinusoidal Wheel-Height Model
Choose amplitude, midline, period and phase from a fictional rotating wheel.
▷ 2 teacher video choices: A Sinusoidal Wheel-Height ModelPreview lesson: A Sinusoidal Wheel-Height Model
Goal: Construct and check a periodic model at key quarter-period times.
Before this: Unit-circle sine and cosine Function transformations
Try together: Build a model with minimum 3, maximum 15, period 24 and a start at the highest point.
Subject-content contributionHSF.TF.B.5High school · Functions
35 minutes
Precalculus and Trigonometry
Suggested grades 11–12 · Unit 3: Periodic models and finite sequences
Finite Geometric Sums in a Design
Derive a finite-sum formula by subtracting shifted copies rather than adding every term.
▷ 2 teacher video choices: Finite Geometric Sums in a DesignPreview lesson: Finite Geometric Sums in a Design
Goal: Derive and apply a finite geometric-series formula with a clearly counted number of terms.
Before this: Geometric sequences Exponent rules
Try together: Find 1+1/2+1/4+1/8+1/16, showing the shifted-sum method.
Subject-content contributionHSA.SSE.B.4High school · Algebra
Earlier high school starter lessons with teacher video choices →