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LAR: Yes
Title: Reflect on This
Url: http://illuminations.nctm.org/Lesson.aspx?id=1410
Publisher: National Council of Teachers of Mathematics
Description: This geometry lesson from Illuminations examines regular polygons. Students will study reflections using hinged mirrors and examine the interior angles of regular polygons. The lesson allows students to look at the relationship between the number of sides in a regular polygon and the measure of its central angles. An animated video demonstrating the experiment is included with the lesson. The lesson is intended for grades 9-12 studying geometry and should take two class periods to complete.
LC Classification: Science -- Mathematics -- Geometry -- Elementary geometry -- Study and teaching. Research
Science -- Mathematics -- Geometry -- Special topics in plane geometry -- Straight lines, angles, triangles, etc.
Science -- Physics -- Optics. Light -- Geometrical optics -- Lens and mirror systems
Science -- Physics -- Optics. Light -- Optical instruments and apparatus (General) -- Special instruments, A-Z -- Kaleidoscopes
GEM Subject: Mathematics -- Instructional issues
Mathematics -- Geometry
Key Concept: Mathematics -- Angles
Mathematics -- Polygons
Mathematics -- Geometry
Key Concepts Complete: Yes
Resource Type: Demonstrations
Instructional Materials
InteractiveResource (DCMI Type Vocabulary)
Lesson Plans
Mathematical Models
Mathematics Materials
MovingImage (DCMI Type Vocabulary)
Teaching Guides
Text (DCMI Type Vocabulary)
Format: html
mov
pdf
quicktime
Audience: Secondary Education
Students
Teachers
Language: English
Rights: National Council of Teachers of Mathematics
Access Rights: Free access
Date Of Record Release: 2011-01-13 03:00:02 (W3C-DTF)
Date Last Modified: 2013-12-12 10:07:02 (W3C-DTF)
Source: Scout Staff  Scout Staff
Full Record Views: 71
Resource URL Clicks: 5
Cumulative Rating: NOT YET RATED
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