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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Geometry
Suggested grades 9–11 · Unit 2: Similarity and right-triangle measures
Similar Triangles and a Shadow Estimate
State the similarity assumptions before using a proportion.
▷ 2 teacher video choices: Similar Triangles and a Shadow EstimatePreview lesson: Similar Triangles and a Shadow Estimate
Goal: Justify a similar-triangle model and calculate a height with labeled corresponding sides.
Before this: Ratios Triangle angle sums
Try together: Use a 2 m reference with a 3 m shadow to estimate the height for a 12 m shadow.
Subject-content contributionHSG.SRT.B.5High school · Geometry
40 minutes
Geometry
Suggested grades 9–11 · Unit 2: Similarity and right-triangle measures
Right-Triangle Trigonometry in a Diagram
Choose a ratio from a labeled reference angle and check the result.
▷ 2 teacher video choices: Right-Triangle Trigonometry in a DiagramPreview lesson: Right-Triangle Trigonometry in a Diagram
Goal: Calculate an unknown side and angle in right-triangle models.
Before this: Pythagorean theorem Ratios Degree-mode calculator
Try together: For an angle of 30° and hypotenuse 10 cm, find opposite and adjacent legs.
Subject-content contributionHSG.SRT.C.8High school · Geometry
Earlier high school starter lessons with teacher video choices →