Question

You’re making three party hats. How much paper will we need , if the radius is 4 inches and slant height 5 inches to the nearest tenth

Answer 1

188.4 square inches

Explanations:

The given hats is in form of a cone. The lateral area of the hat (we use lateral hat since party hat has no base) is given as:

`L=\pi rl`

where:

r is the radius of the hat

l is the slant height

Given the following parameters;

r = 4inches

l = 5inches

Determine the lateral area of a hat

`\begin{gathered} L=3.14*4*5 \\ L=62.8sq.in \end{gathered}`

Since there are three party hats, the lateral surface area of the three hats will be:

`\begin{gathered} L=3(62.8) \\ L=188.4sq.in \end{gathered}`

Hence the amount of paper needed for the three hats is 188.4 square inches