1. 1.4 Surface Area of Other Composite Objects
Lesson 4 Math 9

2. Quick Review
A right rectangular prism has 3 pairs of congruent (identical) faces.
The top and bottom faces
The front and back faces
The left and right side faces
The surface area is the sum of the area of all the faces

3. SA = 2 x area of the top + 2 x the area of the side + 2 x area of the front

4. A right triangular prism has 5 faces
2 congruent triangular faces
3 rectangular faces
The surface area is the sum of the areas of the rectangular faces, and the triangular bases.

5. SA = 2 x area of base + areas of the 3 rectangular faces.
Remember:
Area of a triangle;
Base x height 2
B x h
Base
Base

6. A cylinder has 2 circular bases, and a rectangle with one side equal to the circumference of the circle, and the other equal to the height of the cylinder.
The surface area is the sum of the 2 circular bases, and the rectangle.

7. SA = 2 x area of one circular base + (circumference of base x height of cylinder)
SA = (2 x 𝜋 𝑟 2 )+(2 𝜋𝑟 x height) r
height

8. Unit 1 Assignment 4
p. 40 #3ace, 4a, 5, 6