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Question

asked Dec 1, 2020 162k views

2 Answers

Eligijus Pupeikis · Answer 1 · 2020-12-04T04:39:07+0000

Answer:

The correct answer is option B. 96π

Explanation:

Points to remember

Surface area of cylinder = 2πr(r + h)

Where r is the radius of cylinder and h is the height of cylinder.

From the figure we get r = 4 cm and h = 8 cm

To find the surface area of cylinder

Surface area = 2πr(r + h)

= 2π * 4(4 + 8)

= 96π

The correct answer is option B. 96π

Nulano · Answer 2 · 2020-12-06T16:06:06+0000

Answer:

Option D.

$A =96\pi\ cm^2$

Explanation:

The area of the circular bases is:

$A_c = 2\pi(a) ^ 2$

Where

$a=4\ cm$ is the radius of the circle

Then

$A = 2\pi(4) ^ 2$

$A = 32\pi\ cm^2$

The area of the rectangle is:

$A_r=b * 2\pi r$

Where

$b=8\ cm$

b is the width of the rectangle and
$2\pi r$ is the length

Then the area of the rectangle is:

$A_r=8 * 2\pi (4)$

$A_r=64\pi\ cm^2$

Finally the total area is:

$A = A_c + A_r\\\\A = 32\pi\ cm^2 + 64\pi\ cm^2\\\\$

$A =96\pi\ cm^2$