Question

Find the surface area of the composite solid. Round your answer to the nearest hundredth.

Answer 1

The total surface area of the composite solid, can be decomposed into three areas:

1 the circular base
2 the lateral surface area of the cylinder (a rectangle)
&
3 the lateral area of the cone (a sector)

Answer 2

The area of a circle (or radius \(r\)) is :
\[A_\text{circle} = \pi r^2\]

Answer 3

The area of a rectangle (of width \(w\), height \(h\)) is:
\[A_\text{rectangle} = w\times h\]

Answer 4

so i tryed it and got c is that right

Answer 5

i don't know,

Answer 6

that makes to of us

Answer 7

The area of the sector (of radius \(r\), and slope \(s\)) is:
\[A_\text{sector} = \pi r s\]

Answer 8

add them all together, what do you get ?
(before plugging in the numbers)

Answer 9

i put c and i only got 30 min :( and got 6 more questions

Answer 10

i dont know what the answer is, we have to work it out

Answer 11

\[SA_\text{total} = A_\text{circle}+A_\text{rectangle}+A_\text{sector}\\
\qquad\quad= \quad. . .\]

Answer 12

https://www.youtube.com/watch?v=Qmb9cnx__hA

Answer 13

never mind that one i guessed cuz ii need to do the rest befopre time runs out

Answer 14

NB:
the width of the rectangle the circumference of a circle
\[w =C = 2\pi r\]

Answer 15

\[SA_\text{total} = A_\text{circle}+A_\text{rectangle}+A_\text{sector}\\
\qquad\quad= \pi r^2+2\pi r h+\pi rs\\
\qquad\quad= \pi r(r+2h+s)\\
\qquad\quad= \quad. . .\]