Question

a paper coffee filter has a radius of 6 centimeters and a slant of height of 12 centimeters. find the surface area of the filter. round your answer to the nearest whole number.

Answer 1

Using the formula πrl +πr²
$\pi = 3.142$
$l = 12cm$
surface area of the filter which is in form of a right cone is πrl+πr²

$(3.142 \times 6 \times 12) + (3.142 \times {6}^{2})$
=339.336
=339cm² to nearest cm