CLASS 9 | CHAPTER-11 | SURFACE AREA AND VOLUME CONCEPT CONE

EXAMPLE-1 : Find the surface area of a right circular cone whose slant height is 10 cm and base radius is 7 cm? एक लम्ब वृत्तीय शंकु का पृष्ठीय क्षेत्रफल ज्ञात करो जिसकी तिर्यक उंचाई 10 cm है और आधार की त्रिज्या 7 cm है ? EXAMPLE-2:The height of a cone is 16 cm and the radius of the base is 12 cm. Find the curved surface area of the cone? EXAMPLE-3: A corn cob is somewhat cone shaped. The radius of its widest end is 2.1 cm and its length (height) is 20 cm. If there are on an average four kernels on every 1cm2 surface of the corn cob, then find how many kernels will be there on the whole corn cob? TIMELINE: CONCEPT : 00:02 EXAMPLE : 1 : 06:45 EXAMPLE : 2 : 10 :34 EXAMPLE : 3 : 12: 42