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Anna [14]
3 years ago
11

This container is composed of a right circular cylinder and a right circular cone. The diameter is 20, the height of the cylinde

r is 9, and the slant height of the cone is 16. Find the surface area
Mathematics
1 answer:
kupik [55]3 years ago
3 0

Answer:

<h2> Total -CSA= 1068.28</h2>

Step-by-step explanation:

This problem is on the mensuration of solids, a cylinder and a cone combined (a frustum)

We are required to solve for the total curve surface areas both solids

hence the curve surface area (henceforth CSA) of a cylinder is given as

CSA-cylinder=2\pi rh

CSA-cone= \pi rl

Total CSA= 2\pi rh+\pi rl

Given data

diameter d= 20

radius = d/2= 20/2= 10

height of cylinder h= 9

slant height of cone l= 16

substituting our data into the expression we have

Total -CSA= 2*\pi *10*9+\pi *10*16\\\\Total -CSA= 565.56+502.72\\\Total -CSA= 1068.28

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ki77a [65]

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7(3a + 5)

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2 years ago
Hello I don’t understand question 9 a and b. Please show working out.<br> Thanks
brilliants [131]
A) I would make the positive integer x and then form an equation.

x + 30 = x^2 - 12
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Since the question asks for a positive integer the answer is 7.

B) two positive numbers x and y.

X - y = 3
x^2 + y^2 = 117

Use these simultaneous equations to figure out each number.

Rearrange the first equation

x = y + 3

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3 years ago
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