09.2.2 Curved Surface Area of Cones (divide in different sector)

Find the area of the curved surface area of the cone of base radius [i]r[/i] and slanted height [i]l[/i]. (Click http://ggbtu.be/m166737 to see how the curved surface area of the cone equals this sector).
Anthony C.M. Or[br]GeoGebra Institute of Hong Kong
– KK Ip, Anthony OR 柯志明

Informatie: 09.2.2 Curved Surface Area of Cones (divide in different sector)