Problem: the radius of a cone is 49 m , slant height is 35 m . find the curved surface area ?
Rationale: "cone curved surface area = ï € rl 22 / 7 ã — 49 ã — 35 = 154 ã — 35 = 5390 m ( power 2 ) answer is b ."
annotated_formula: volume_cone(49, 35)