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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See what a course builds on, follow a suggested unit path and practice a useful skill. For students, families, homeschoolers, tutors and teachers.
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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Geometry
Suggested grades 9–11 · Unit 3: Circles and three-dimensional measurement
Arc Length, Radians and Sector Area
Use similarity to explain why arc length divided by radius depends on the angle.
▷ 3 teacher video choices: Arc Length, Radians and Sector AreaPreview lesson: Arc Length, Radians and Sector Area
Goal: Derive arc and sector formulas and apply them with consistent units.
Before this: Circle circumference and area Similarity
Try together: Find arc length and sector area for r=4 m and θ=π/2.
Subject-content contributionHSG.C.B.5High school · Geometry
35 minutes
Geometry
Suggested grades 9–11 · Unit 3: Circles and three-dimensional measurement
Volume Comparisons for Solid Designs
Compare equal dimensions without confusing radius, diameter and height.
▷ 2 teacher video choices: Volume Comparisons for Solid DesignsPreview lesson: Volume Comparisons for Solid Designs
Goal: Calculate and compare cylinder, cone, pyramid and sphere volumes.
Before this: Area formulas Algebraic substitution
Try together: Find a cone’s height when its radius is 2 cm and volume is 20π cm³.
Subject-content contributionHSG.GMD.A.3High school · Geometry
Earlier high school starter lessons with teacher video choices →