Question

Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Find its curved

surface area.​

Answer 1

Answer:-

Given:-

• Diameter of the base of a cone = 10.5cm

• Slant height = 10cm

To find:-

• The curved surface area

Solution:-

Curved surface area of cone = πrl

Radius (r) of the base of cone = (10.5/2)cm⇒5.25cm

Slant height (l) of cone = 10cm

Curved surface area of cone = πrl

⇒(22/7×5.25×10)cm²

⇒(22/7×525/100×10)cm²

⇒(22×75/100×10)cm²

⇒165m²

Therefore, the curved surface area of the cone = 165m²

Answer 2

Answer:

Radius of the base of cone = diameter/ 2 = (10.5/2)cm = 5.25cm

Slant height of cone, say l = 10 cm

CSA of cone is = πrl

= (22/7)×5.25×10 = 165

Therefore, the curved surface area of the cone is 165 cm2.

hope will be helpful ☺️