## Building Using the Front-Right-Top View

• Lesson
6-8
1

Students explore drawing the front-right-top view when given a three dimensional figure built from cubes. Students also explore building a three dimensional figure when given the front-right-top view.

As a review from the previous lesson, discuss the role of isometric drawings as one way to represent a three dimensional figure. In this lesson, students will compare isometric drawings with another type of representation, namely the front-right-top (FRT) view.

For example, project the following images onto the overhead projector or television monitor:

Isometric Representation:

Front-Right-Top Representation:

The following PDF will allow you to print out the above images on an overhead transparency:

 Front-Right-Top Views (Images)

Ask students to discuss, with a partner, what they notice about each of these representations. They may discuss the benefits of using each kind of representation. Some students may say they think it is easier to draw one representation over the other. Or they may discuss how they could use the isometric drawing tool to create each of these representations.

Using the View tool and the Rotation controls on the Isometric Drawing Tool, students should do the following:

1. Create a three dimensional figure out of cubes. The figure should be somewhat complicated, such as the one students just saw.
2. Use the View button to see a 3D view.
3. Uncheck the 3D "box" to see a Front-Right-Top view.
4. Check the 3D box to see the three-dimensional view once again.

As students are moving between views, they should observe how the views change and how they relate to the original three dimensional figure they created.

Going back to the original figure and view they created, students should delete one cube from their picture. Ask them to note what they observe about the Front-Top-Right view. Students should continue deleting cubes. Ask them to note the fewest number of cubes they can delete to make the front view look different, the right view look different, and the top view look different. If needed, students can try again using another figure they have created.

The next portion of the lesson will focus on students building the three dimensional figures when given the Front-Right-Top views.

Project the following images onto the overhead projector or television monitor for students to see:

(These images are located on the same PDF as the images previously projected.)

Using the isometric drawing tool, students should construct isometric drawings that match each set of FRT views. Then, they should copy these drawings onto isometric dot paper. You may wish to encourage students to keep the FRT tool open while they draw.

As students finish their drawings, they can compare their results with their partners. Did they get the same drawings? Have students discuss any variations with their partners.

none

Questions for Students

1. Do you think the front-right-top representation contains all the same information as an isometric view?

[No, the three dimensional aspect is not necessarily present.]

2. In the previous activities you saw that sometimes two solids have the same FRT view but different isometric views. Do you think it is possible for two solids to have the same isometric drawing, but different FRT views? If so, create an example using the drawing tool. If not, convince a partner why.

[Students solutions and drawings will vary.]

3. For what applications might a FRT view be more useful than an isometric view? For what applications might an isometric view be more useful? Explain your thinking in both cases.

[Student responses may vary.]

### Exploring the Isometric Drawing Tool

6-8
Students explore using the isometric drawing tool and gain practice and experience in manipulating drawings.

### Finding Surface Area and Volume

6-8
Using the isometric drawing tool, students build three-dimensional figures and find the surface area and volume of each figure.

### Using Cubes and Isometric Drawings: Mat Plans

6-8
Students explore drawing a mat plan when given a three dimensional figure built from cubes. Students also explore building a three dimensional figure when given the mat plan.

### Do They Match?

6-8
Using three dimensional figures they have constructed, students determine when two isometric drawings can represent the same shape and explain their reasoning. Students will also determine what possible shapes might have the same isometric drawing and explain their reasoning.

### Are They Possible?

6-8
Students examine some isometric drawings that seem to be impossible and investigate one way Escher used to create these "impossible" figures.

### Learning Objectives

Students will:

• Draw the Front-Right-Top view when given a three dimensional figure built from cubes
• Build a three dimensional figure when given the front-right-top view