Parallel Lines Project
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TED Talk: Euclid’s puzzling parallel postulate- Jeff Dekofsky
This high school math resource explores Euclid’s geometry, the parallel postulate, and the development of non-Euclidean geometry, connecting mathematical theory to real-world applications and critical thinking. Best for: Math, Geometry, STEM, Critical Thinking Includes: • 20 discussion and comprehension questions • Analytical essay prompt • Structured essay with paragraph guidance and sentence starters • Classroom debate activity • Critical thinking discussion questions Grades: 8–12, College, Ad
9th - 12th, Adult Education, Higher Education
Applied Math, Geometry, Other (Math)
Lesson Plan: Parallax and Trigonometry
This lesson engages high school students in understanding how trigonometry is applied to measure distances using the principle of parallax, a key method in astronomy. Students investigate how a shift in viewpoint creates a measurable angle that, combined with a known baseline, forms a triangle. By applying trigonometric functions and small-angle approximations, students calculate distances to objects, simulating the method astronomers use to determine the distance to nearby stars. Through intera
7th - 12th, Adult Education, Higher Education
Anatomy, Geometry, PreCalculus
CCSS, NGSS
HSG-CO.D.12
, HSG-SRT.C.8
, HSS-ID.B.6
+4
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