find the curved surface area , if the radius of a cone is 28 m and slant height is 30 m ?
"cone curved surface area = ï € rl 22 / 7 ã — 28 ã — 30 = 88 ã — 30 = 2640 m ( power 2 ) answer is b ."
multiply(const_pi, multiply(28, 30))