#### Consortium for Mathematics and its Applications

Product ID: TechMAP
Supplementary Print
High School

# TechMAP - Circle Relationships in Carpentry - Teacher Edition

### Author: Gary Froelich

Several carpentry problems related to circles are examined in this module, including determining the size of a circular piece of stock when only part of it is visible and determining the lines of cut for a rafter. The primary mathematical topics in this module are length relationships in a pair of intersecting chords, central angles, and inscribed angles.

TechMAP

Covering topics from Algebra I to Precalculus, TechMAP modules show high school students real, immediate uses for mathematics.

All students MUST PASS the same standardized tests in order to graduate and succeed. All 22 TechMAP modules show tangible, real-world applications of the material on these exams, driving home required math skills.

The mathematics required by state tests is taught in algebra and geometry courses, but for many students this is not enough. TechMAP modules demonstrate these skills in vocational fields; they help reinforce existing mathematics courses through actual career activities. These modules are self-contained with exercises, teacher notes, handouts, etc., and can be used individually or together. Each module takes one to three weeks of classroom time.

• A builder finds the slope of a roof the same way an
algebra student finds the slope of a line.
• A farmer selling her wheat must decide between several
grain elevators in different locations. She uses conic
sections and parameters on elementary models to make
her decision.
• An exploration into the packaging industry reveals area
formulas.
• GPS devices are everywhere today, and our module
explains how they actually work; students become well-versed
in spherical geometry, time differences, and codes.
• Carpenters work with shapes and relationships every
day, and in our modules we explore circle relationships,
differential equations, linear regression, and more.
©2005 by COMAP, Inc.
TechMAP
51 pages

#### Mathematics Topics:

Geometry, Circles (central & inscribed angles)

#### Application Areas:

Engineering & Construction

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### TechMAP - Circle Relationships in Carpentry - Student Edition

Several carpentry problems related to circles are examined in this module, including determining the size of a circul...
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