Volume = 154 m³CSA of the cone = 137.5 m²TSA of the cone = 176 m²Step-by-step EXPLANATION:RADIUS = 3.5 mHeight = 12 mVolumeCurved surface areaTotal surface areaVolume of the cone:↠ The volume of a cone is given by the EQUATION,     Volume of a cone = 1/3 × π × r² × h     where r is the radius of the cone      h is the height of the cone↠ Substitute the data,     Volume of the cone = 1/3 × 22/7 × 3.5 × 3.5 × 12     Volume of the cone = 22 × 0.5 × 3.5 × 4     Volume of the cone = 154 m³↠ Hence volume of the cone is 154 m³.Curved surface area:↠ To find the CSA, we have to find the slant height of the cone.↠ The slant height of a cone is given by,     Slant height = √(r² + h²)↠ Substituting the data,     Slant height = √(3.5² + 12²)     Slant height = √156.25     Slant height = 12.5 m↠ Now the CSA of a cone is given by,    CSA of a cone = π r l    where r is the radius and l is the slant height↠ Substituting the values,     CSA of the cone = 22/7 × 3.5 × 12.5     CSA of the cone = 22 × 0.5 × 12.5     CSA of the cone = 137.5 m²↠ Hence curved surface area of the cone is 137.5 m².Total surface area:↠ The total surface area of a cone is given by,     TSA of cone = π r (r + l)↠ Substitute the data,     TSA of the cone = 22/7 × 3.5 (3.5 + 12.5)     TSA of the cone = 22 × 0.5 × 16     TSA of the cone = 176 m²↠ Hence the total surface area of the cone is 176 m².