Activities

• • • Subject Area

• Math: Geometry: Surface Area and Volume

• Author 6-8

60 Minutes

• Device
• TI-73 Explorer™
• Other Materials
This is Activity 5 from the EXPLORATIONS Book:
Activities for Algebra with the TI-73.

The following materials are required for this activity:
• Card stock paper
• Scissors
• Scale or balance that measures in grams
• Ruler that measures in cm or inches
• Leaves of various sizes

Give Me a Hand or Leaf Me Alone

Activity Overview

In this activity, students' find the surface area of geometric shapes cut from card paper and relate it to its mass. They use this data to find the surface area of irregularly shaped objects.

Before the Activity

• Set up the calculator for data collection using the procedure described in the attached Appendix PDF file
• See the attached PDF file for detailed instructions for this activity
• Print pages 59 - 67 from the attached PDF file for your class
• During the Activity

Distribute the pages to the class.

• Use card stock paper and cut out squares with sides of different lengths (ranging from 1 to 18 cm)
• Measure the mass of the different square cut outs
• Enter the mass and area of the squares data as lists
• Graph a scatter plot and find a linear regression equation for the data
• Graph the best fit line
• Calculate the slope
• Cut out tracings of a hand and a leaf on card stock paper
• Find the mass of the cut-outs
• Find the surface area of the hand and the leaf
• After the Activity

Students will complete the Data Collection and Analysis page and answer questions.

Review student results:

• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary