Unit 1:Day 3

Day 3:Surface area
Explanation:http://www.youtube.com/watch?v=0A0qhoh-aYc
formulas for surface area:

Surface Area of a Cylinder = 2 pi r 2 + 2 pi r h

 (h is the height of the cylinder, r is the radius of the top)

Surface Area = Areas of top and bottom +Area of the side

Surface Area = 2(Area of top) + (perimeter of top)* height

Surface Area = 2(pi r ²) + (2 pi r)* h

Surface Area of a Sphere = 4 pi r 2

 (r is radius of circle)

Surface Area of Any Prism

  (b is the shape of the ends)
Surface Area = Lateral area + Area of two ends
(Lateral area) = (perimeter of shape b) * L
Surface Area = (perimeter of shape b) * L+ 2*(Area of shape b)

Examples:

Quiz:

1)
Find the surface area of a cone with a radius of 3 and a slope of 2.

2)find the surface area of a cylinder with a radius of 15 and a slope of 22.

3)find the surface area of a sphere with the radius of 77.

key:

 1)118.849557522123895 square units

2)23487.1681415929206 square units

3)4506.01769911505square units