110 likes | 254 Views
Surface Area of Circular Solids. Cylinder. Def: A cylinder is a circular solid with two circular bases. r. L.A. = 2 π rh. h. S.A. = 2 π rh +2 π r 2. Cone. Def: A cone is a circular solid with one circular base. L.A. = π rl. l. h. S.A. = π rl + π r 2. r. Sphere.
E N D
Cylinder • Def: A cylinder is a circular solid with two circular bases. r L.A. = 2πrh h S.A. = 2πrh +2πr2
Cone • Def: A cone is a circular solid with one circular base. L.A. = πrl l h S.A. = πrl + πr2 r
Sphere • Def: A sphere is a circular solid with no base S.A. = 4πr2
Example 1 • Find the lateral area and surface area. Leave answers exact unless otherwise specified. 7 25
Example 2 • Find the lateral area and surface area. Leave answers exact unless otherwise specified. 12 13
Example 3 • Find the surface area. Leave answers exact unless otherwise specified. 8
Example 4 • Find the surface area of the solid. Leave answers exact unless otherwise specified. 10 12
Example 5 • Find the surface area of the solid. Leave answers exact unless otherwise specified. 3
Example 6 • The surface area of a sphere is 36π. What is the radius of the sphere?