Question

4.   If the slant height and the base radius of a cone are 10 cm and 8 cm respectively, then find

        (i) curved surface area and

        (ii) total surface area. [Take π = 3.14]

Anyone please answer
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Answer 1

Answer:

Given slant height (l) of cone = 10cm and base radius (r) of cone = 8cm Now, we know that l^2= h^2+ r^2. Therefore, h= √(l^2-r^2), h= √(100-64), h= √36 and h= 6cm. Height of the cone = 6cm. curved surface area of cone=πrl = 3.14(8)(10)= 31.4(8)= 251.2cm^2. Hence the curved surface area of cone is 251.2cm^2.

Step-by-step explanation:

Total surface area of cone = πr(l+r)= 3.14(8)(10+8)= 3.14(8)(18)= 25.12(18)=452.16cm^2. Hence the Total surface area of cone is 452.16cm^2. Hope this helps you.

Answer 2

CSA of cone =251.2 cm²

TSA of cone =452.16 cm²