<meta http-equiv="refresh" content="1; url=/nojavascript/"> Surface Area of Cylinders | CK-12 Foundation
You are reading an older version of this FlexBook® textbook: CK-12 Texas Instruments Geometry Student Edition Go to the latest version.

# 12.1: Surface Area of Cylinders

Created by: CK-12
0  0  0

This activity is intended to supplement Geometry, Chapter 11, Lesson 2.

## Problem 1 – Nets

Start the Cabri Jr. application by pressing the APPS key and selecting CabriJr. Open the file CYLINDER by pressing $Y=$, selecting Open..., and selecting the file. You should see a partial net of a right cylinder.

1. What changes occur to the net when the point $H$ is dragged?

2. What changes occur to the net when the point $R$ is dragged?

3. Record 2 sets of measurements of the net:

Circle Radius Rectangle Height Rectangle Length

4. What is the result when you divide the Rectangle Length by the Circle Radius?

5. Explain this result. Drag point $R$ to confirm your conjecture.

## Problem 2 – Surface Area

6. Record these measurements:

Circle Area: __________

Rectangle $L$: __________

Rectangle Area: __________

Rectangle $H$: __________

7. Record the steps you performed to find the surface area of the cylinder:

1. _________________________________
2. _________________________________

8. What is the surface area of your cylinder?

9. How is the method used in #7 above related to the formula $SA = 2\pi R^2 + 2\pi RH$?

## Date Created:

Feb 23, 2012

Aug 19, 2014
Files can only be attached to the latest version of None