Question

Find the surface area of a cone with a slant height of 18 inches and a radius of 7 inches

Answer 1

The surface area formula of a cone is:
=Area of base ×
`(1)/(2)` × perimeter of base × slant height
=
`\pi`r² +
`\pi`rl
=
`\pi`(7)² +
`\pi`(7)(18)
=49
`\pi` + 126
`\pi`
=175
`\pi` in² (in terms of
`\pi`)
=549.7787 in²
≈ 550 in²

Answer 2

Please see the pic, I'd solved in it.