1. Calculate the Surface Area of a Cone and Sphere
22-Dec-17
Calculate the Surface Area of a Cone and Sphere

2. A = 3.14 x 4 x 16 A = 200.96 cm2 16 cm Area = Π x radius x slope 4 cm
The base of a cone is a circle. This cone’s base radius is 4 cm.
Cones have a sloping side and the length of this cone’s is 16 cm
Formula for the slope’s surface area is:
16 cm
Area = Π x radius x slope
A = 3.14 x 4 x 16
A = cm2
4 cm
The area of the base is Πr2
 3.14 x 4 x 4  50.24
Total SA =
SA = 251.2
4 cm

3. Area = Π x radius x slope s r s Area cm2 1. 5 10 2. 4 20 3. 7 28 4. 25
Find the surface area of cones that have the following sizes: s r s
Area cm2 1. 5 10 2. 4 20 3. 7 28 4. 25 5. 50 6. 8 32 7. 12 36 r

4. Area = Π x radius x slope s r s Area cm2 1. 5 10 157 2. 4 20 251.2 3.
Find the surface area of cones that have the following sizes: s r s
Area cm2 1. 5 10
157 2. 4 20
251.2 3. 7 28
615.44 4. 25
392.5 5. 50
3140 6. 8 32
803.84 7. 12 36 r

5. Surface Area = 4Πr2 SA = 4 x 3.14 x 10 x 10 SA = 1256 cm2
Diameter = 20 cm
Radius is half of the diameter so this sphere’s radius is 10 cm

6. Radius is half of the diameter
Surface Area 1. 5 2. 4 3. 7 4. 15 5. 40 6. 16 d
Radius is half of the diameter
A = 4Πr2

7. Radius is half of the diameter
Area 1. 5 10
314 2. 4 8
200.96 3. 7 14
615.44 4. 15 30
2826 5. 20 40
5024 6. 16
803.84 d
Radius is half of the diameter
A = 4Πr2