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Likurg_2 [28]
3 years ago
13

WILL MARK BRAINLIEST

Mathematics
2 answers:
antoniya [11.8K]3 years ago
7 0

Answer:

819.54 cm^2

Step-by-step explanation:

We are given

Slant height = l = 20cm

and

Diameter = d = 18 cm

We have to find radius first

r = d/2 = 18/2 = 9 cm

The formula for surface area is:

SA = \pi rl+\pi r^2\\= (3.14 * 9 * 20) + (3.14 * (9)^2)\\=565.5+254.34\\=819.84\ cm^2

As second option is nearest to calculated answer, it is the correct option ..

scoundrel [369]3 years ago
6 0

Answer: second option.

Step-by-step explanation:

We know that we can calculate the surface area of a cone with this formula:

SA=\pi rl + \pi r^2

Where "r" is the radius and "l" is the slant heigth.

We know that the radius is half the diameter, then the radius of this cone is:

r=\frac{18cm}{2}\\\\r=9cm

Since we know the radius and the slant height, we can substitute values into the formula, using 3.14 for π.

Therefore, we get:

 SA=(3.14)(9cm)(20cm) + (3.14)(9cm)^2=819.54cm^2

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rosijanka [135]

Answer:

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Step-by-step explanation:

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i think

7 0
3 years ago
What is y=-2/3 x + 4 in standard form?
maxonik [38]

Answer:

2x + 3y = 12

Step-by-step explanation:

Standard form is Ax + By = C, A, B and C must be intergers, cannot be  fractions or decimals

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3y = -2x + 12 Now make the constant be on one side by itself

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5 0
3 years ago
Read 2 more answers
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beks73 [17]
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4 0
3 years ago
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Infinito álgebra For -2x-9y=-25 and -4x-9y=-23
Levart [38]
-2x -9y = -25
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7 0
3 years ago
Use the graph of y = f(x) to graph y= f(x) + 2
Mama L [17]

Explanation:


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