Getting "A-Round" Area

Author

Texas Instruments

Alignment

Standards Alignment

Textbook Alignment

Subject Area

Math: Middle Grades Math: Geometry

Level

6-8

Activity Time

45 Minutes

TI Calculator

TI-Nspire™ CX series

TI-Nspire™ CX CAS/CX II CAS

TI-Nspire™ Apps for iPad®

TI-Nspire Version

3.6

Resource Types

Lessons

Format

TNS

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Getting "A-Round" Area

Activity Overview

This lesson involves using sectors of a circle to form a parallelogram and, from this shape, investigating the area formula for a circle.

Objectives

Students will give an informal derivation of the relationship between the circumference and area of a circle

Vocabulary

circumference
area
pi
radius of a circle
parallelogram

About the Lesson

The lesson assumes students have a knowledge of the area formula for a parallelogram.

The lesson involves using sectors of a circle to form a parallelogram and, from this shape, investigating the area formula for a circle.

As a result, students will:

Use approximations for the circumference and radius of a circle.
Connect circumference and radius of a circle to the dimensions of the constructed parallelogram to develop an area formula for a circle.

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Lesson Files

Student Activity DOC Student Activity PDF Teacher Notes PDF TI-Nspire Activity TNS

Author

Texas Instruments

Alignment

Standards Alignment

Textbook Alignment

Subject Area

Math: Middle Grades Math: Geometry

Level

6-8

Activity Time

45 Minutes

TI Calculator

TI-Nspire™ CX series

TI-Nspire™ CX CAS/CX II CAS

TI-Nspire™ Apps for iPad®

TI-Nspire Version

3.6

Resource Types

Lessons

Format

TNS

Report an Issue

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Vernier EasyData,Vernier EasyLink and Vernier EasyTemp are registered trademarks of Vernier Science Education.

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