Section1.4_Surface_Area_of_Cones_and_Spheres.notebook
October 19, 2012
Section 1.4: Surface Area of Cones and Spheres
Cone:
h - height
s -slant height
s
-s
la
r - radius
nt
he
ig
ht
SA = Area of Circular Base + Area of Curved Surface
SA = πr2 + πrs
To find the surface area of a cone, you need the slant
heiqht. If you don't know the slant height, you find it using
Pythagorean Theorem.
a2 + b2 = c2
h
r2 + h2 = s2
s
r
1
Section1.4_Surface_Area_of_Cones_and_Spheres.notebook
Sphere:
October 19, 2012
SA = 4πr2
Example: Find the surface area of each object.
A)
12 in
6 in
B)
12 in
9 in
2
Section1.4_Surface_Area_of_Cones_and_Spheres.notebook
October 19, 2012
c)
r = 24 in
P. 45, Questions 1-7
p. 47 - 48, Questions 1- 5
p. 48 - 49, Questions 1 - 3
3
Section1.4_Surface_Area_of_Cones_and_Spheres.notebook
October 19, 2012
18 in
8 in
4
Section1.4_Surface_Area_of_Cones_and_Spheres.notebook
October 19, 2012
5