Calculate the Surface Area of a Cone and Sphere

1
22-Nov-09
Calculate the Surface Area of a Cone and Sphere
Level B/A Topic
2
The base of a cone is a circle. This cones base
radius is 4 cm. Cones have a sloping side and the
length of this cones is 16 cm Formula for the
slopes surface area is
16 cm
Area ? x radius x slope A 3.14 x 4 x 16 A
200.96 cm2
4 cm
The area of the base is ?r2 ? 3.14 x 4 x 4 ?
50.24 Total SA 200.96 50.24 SA 251.2
4 cm
3
Area ? x radius x slope
Find the surface area of cones that have the
following sizes
s
r
4
Area ? x radius x slope
Find the surface area of cones that have the
following sizes
s
r
5
Surface Area 4?r2 SA 4 x 3.14 x 10 x 10 SA
1256 cm2 And if you have the area and want the
radius r v(A (4?)) r v(1256 (4 x 3.14)) r
v(1256 (12.56)) r v100 ? r 10 cm
Diameter 20 cm
Radius is half of the diameter so this spheres
radius is 10 cm
6
d
Radius is half of the diameter
A 4?r2 r v(A (4?))
7
d
Radius is half of the diameter
A 4?r2 r v(A (4?)) r v(A 12.56)
8
s
r
9
s
r