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# Search Results

 Resource Search Results Search Site for 'areas of polygons'
 Results 1 - 7 of 7: Modify Your Search areas of polygons in the entire record
Filter these results by ORC topics: Geometry (6) | Plane Figures (2-D) (6) | Area (4) | Congruence (3) | Similarity (3) | Measurement (3) | Models, construction (2) | Algebra (1) | Patterns, sequences (1) | Solid Figures (3-D) (1)
1
Investigating Special Right Triangles and Area of a Regular Polygon
ORC# 8865
Resource Information
Resource Type: Lessons
Discipline: Mathematics
Professional Commentary: This?3-lesson unit?engages students?in investigating special right triangle properties for both 30?? 60?? 90? and 45?? 45?? 90? triangles. Students develop the general formula for the area of any regular polygon using Geometer?s Sketchpad&#174; and apply special right triangle properties to find the area of equilateral triangles, squares, and hexagons....
2
Area Formulas: Finding the Area of Irregular Figures
ORC# 5281
Resource Information
Resource Type: Lessons
Discipline: Mathematics
Professional Commentary: Students will estimate the areas of highly irregular shapes and will use decomposition to calculate the areas of irregular polygons. A sheet of regular polygonal shapes is provided to cut out and cover the irregular shapes....
3
Discovering Pick?s Formula
ORC# 10161
Resource Information
Resource Type: Content Supports -- Activities and rich problems
Discipline: Mathematics
Professional Commentary: Students use various strategies to find the areas of different polygons drawn on dot paper. After a discussion about what variables could possibly be used in a formula to calculate the areas, students gather data about the given polygons and many others....
4
Understanding Ratios of Areas of Inscribed Figures Using Interactive Diagrams
ORC# 1474
Resource Information
Resource Type: Lessons
Discipline: Mathematics
Professional Commentary: This NCTM E-Example features four student tasks along with teacher support material about using interactive figures with students to explore the connections between algebra and geometry. This site features an applet that students can use to explore an interesting quantitative relationship between the area of a polygon and the area of an inscribed figure formed by...
5
Computing Pi
ORC# 13765
Resource Information
Resource Type: Content Supports
Discipline: Mathematics
Professional Commentary: This?applet demonstrates?how the Greek mathematician, Archimedes, approximated the value of pi?by?inscribing?and circumscribing polygons about a circle. Student can use the slide bar at the bottom of the applet to increase the number?of sides, n, of inscribed and circumscribed polygons for two circles.?The first circle is a unit circle which has has an area of pi....
6
Archimedes' Puzzle
ORC# 10335
Resource Information
Resource Type: Lessons
Discipline: Mathematics