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Ipatiy [6.2K]
3 years ago
6

Help me please

Mathematics
1 answer:
dsp733 years ago
8 0

Answer:

ooooo

Step-by-step explanation:

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I need to find the surface area. it's a cut sphere with a diameter of 14.
alex41 [277]

Given data:

The diameter of the cut sphere, D=14 in.

The radius of the cut sphere is,

\begin{gathered} r=\frac{D}{2} \\ r=\frac{14}{2} \\ r=7\text{ in} \end{gathered}

The cut sphere is called a hemisphere.

The surface area of a sphere is

A_1=4\pi r^2

So, the lateral surface area of a hemisphere is half the surface area of sphere. Therefore, the lateral surface area of a hemisphere is,

\begin{gathered} A_2=\frac{4\pi r^2}{2} \\ A_2=2\pi r^2 \end{gathered}

The hemisphere has a lateral surface and a circular surface. The area of the circular surface is,

A_3=\pi r^2

Therefore, the total area of the hemisphere is,

\begin{gathered} A=A_2+A_3 \\ A=2\text{ }\pi r^2+\pi r^2 \\ A=3\text{ }\pi r^2 \end{gathered}

The total surface area of a hemisphere is,

\begin{gathered} A_{}=3\text{ }\pi r^2 \\ A=3\text{ }\pi\times7^2 \\ A=461.8in^2 \end{gathered}

Therefore, the total surface area of the cut sphere is 461.8 square inches.

6 0
1 year ago
Find the volume of a cylinder with a radius of 5 cm and a height of 7 cm.​
vampirchik [111]

Answer:

549.78

Step-by-step explanation:

V=πr2h=π·52·7≈549.77871

6 0
2 years ago
Read 2 more answers
Find the value of x<br> Use sin, cos, or tan
Serhud [2]
<h3>Answer:   16.5</h3>

=========================================================

Explanation:

We use cosine to tie together the adjacent and hypotenuse

cos(angle) = adjacent/hypotenuse

cos(38) = x/21

21*cos(38) = x

x = 21*cos(38)

x = 16.5482258257411

x = 16.5

3 0
3 years ago
1,679 rounded to the nearest thousand
polet [3.4K]
The answer is 1700 because 1679 rounded to the nearest hundred is 1700
8 0
3 years ago
600/480 as a fraction in m/n form
Julli [10]

Answer:gcd is of 600 is 120 600÷120 and 480 ÷120 reduced fraction 5/4

Step-by-step explanation:

8 0
3 years ago
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