Help plz( If the shell of a bass drum was cut down one side and laid flat, which expression would give the area, A, of the shell with the measurements shown? )

Question

asked Aug 14, 2020 111k views

2 Answers

Aright · Answer 1 · 2020-08-18T12:48:56+0000

Answer:

Last option:
$A=2\pi rh$

Explanation:

If the shell of a bass drum was cut down one side and laid flat, the resulting shape would be a rectangle.

The area of a rectangle can be calculated with the formula:

A=l*w

Where l is the lenght and w is the width.

In this case, the lenght of the rectangle obtained (the lenght of the shell) is the circumference of the drum.

Remember that the circumference of the circle can be calculated with:

$C=2\pi r$

Where r is the radius of the circle.

Then:

$l=2\pi r$

The width is the height of the shell:

w=h

Then, substituting into
A=l*w , you get:

$A=2\pi rh$