1. Chapter 5
Surface Area

2. 5.1 Views of 3-D Objects Key Words
A flat or curved surface.
Key Words
FACE-A flat or curved surface
EDGE-A line segment where two faces meet.
VERTEX-The point where three or more edges of a figure meet. The plural is vertices.

3. 2D vs. 3D 2 dimensional (2D) objects are flat
3 dimensional (3D) objects have depth

4. Starter Question For each of the following objects determine: 3 2 1
the number of faces (sides)
the 2D shapes that forms the object’s structure 1 2 3

5. Answers 1. Cube a) 6 faces b) squares 1 2.Cylinder 3 faces
2 circles, 1 rectangle 2
3.Triangular prism
a) 5 faces
b) 2 triangles, 3 rectangles 3

6. 2D Drawings of 3D Objects Ex 1. Tissue Box
3D objects can be represented by a set of 2D drawings from:
Top/Bottom View
Front/Back View
Left & Right Side View
Ex 1. Tissue Box
Top
front
side

7. Try one: Draw and label top, front and side views of these items
a) Soup Can

8. Try one: Build the object with 6 blocks and then draw the top, front and side views of this object

9. Ex 2: Sketch a 3-D object When
Given Views

10. Try One:
Top
Front
Side

11. Ex 3-Draw top, front and side view
after 90o rotation
Top
Side
Front
Top
Side
Front

12. Assignment
5.1 CYU pp. 168 – 169 #3, 4, 5,6, 7, 9

13. Fruedenthal Institute Wisweb – Guess the View
►Login as Guest ►Scroll down – click on “Views” ►Click on “Guess the View”
►Click on “Views” (at the top with the back arrow) ►Click on “Profielen Draaien”