Total surface area of cone = Curved surface area + Area of the base
Illustration: Find the total surface area of a cone, if its slant height is 12 m and the radius of its base is 9 m.
Solution: We know that the total surface area S of a right circular cone of radius r and slant height l is given by S= .
Here, r = 9 m and l = 12 m.
Therefore
Illustration: The total surface area of a cone is If the slant height of the cone be 8 cm, find the radius of the base.
Solution: Given: Area of the curved surface of a cone is and slant height of the cone = 8 cm
Also, we know that the Total surface area of the cone
As l = 8, hence we have
As r cannot be negative, So we must have
Hence, radius of the base is
Find the total surface area of a right circular cone with radius 6 cm and slant height 8 cm. | |||
Right Option : C | |||
View Explanation |
The total surface area of the cone is 1056 sq m and radius of the base is 7 m. Find the slant height of the cone. | |||
Right Option : C | |||
View Explanation |
The total surface area of the cone is 425 sq m and the radius of the base of the cone is 14 sq m. Find the slant height of the cone. | |||
Right Option : A | |||
View Explanation |
I have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
About Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
My experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
It was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
One of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Being a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
It has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
My experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Abhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.