Download presentation

Published byAri Brasher Modified over 9 years ago

1
**1.3 Surface Areas of Objects Made from Right Rectangular Prisms**

2
**Determining the SA of a Composite Object Made From Cubes**

Each cube has edge length of 2cm. Determine the surface area.

3
Method 1 Draw all 6 views and count all the squares. Front Left Side Top 4 3 2 Bottom Right Side 3 Back 2 4 Total: 18 Squares

4
**The area of each square is:**

A= l x w A= 2cm x 2cm = 4 cm2 We have 18 of these squares, so: Total Area = 18 x 4 cm2 = 72 cm2

5
Method 2 Our composite object is made up of 4 squares. Each cube has 6 square faces. So the total number of squares is: 4 x 6 = 18

6
The cubes overlap at 3 places, so there are 3x2, or 6 squares that are not included in the surface area. So the surface area in squares is: 24 – 6 = 18 Each square has area 2cm x 2cm = 4cm2 So the surface area is 18 x 4cm2 = 72cm2

7
**Determining the Surface Area of a Composite Object Made from Right Rectangular Prisms**

8
**2 1 3 1 2 3 50 m 30 m 30 m 20 m 20 m 30 m 20 m 6 Squares, each have**

side length 10m

9
**My favourite method: Figure out the Surface area of all the objects.**

Figure out the surface area where the objects overlap. Subtract that area from the total.

10
Assignment Time

Similar presentations

© 2024 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google