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3 years ago

Find the area of a semicircle with radius r

Mathematics

2 answers:

Anna [14]3 years ago

6 0

Answer:

Area of semicircle is

$\frac{1}{2} (\pi \times {r}^{2} )$

If you are helped with my answer pls tag me brianliest I really want it

THANK YOU......

iren [92.7K]3 years ago

4 0

Answer:

To calculate the area of a semicircle

We are gonna have to use the formula :

$\frac{1}{2}$ π r² [ that is the formula to calculate the area of a semicircle ]

Step-by-step explanation:

If we want to calculate the radius of a semicircle with 4 ft --

we would first write the formula which is " $\frac{1}{2}$ π r²"

Then, you would write: $\frac{1}{2}$ π (4 ft)²

After that, you would write: $\frac{1}{2}$ (3.14)(16)

Type that into a calculator and you would get 25.12 as your answer

Why did we write 3.14 and 16? [ $\frac{1}{2}$ (3.14)(16) ]

Bc, the first digits of pi are 3.14 .

We wrote 16 because 4² = 16 [ 4x4=16 ]

My explanation isn't that good so I would suggest watching the math antics video which is named "Circles, Circumference And Area"

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A Country’s population in 1990 was 134 million. In 2000 it was 139 million. Estimate the population in 2014 using the exponentia

Ivahew [28]

Answer:

167 million

Step-by-step explanation:

The ratio is 1 million people every 2 years

7 0

3 years ago

The formula is: <img src="https://tex.z-dn.net/?f=v%20%3D%20%20%5Cfrac%7B4%7D%7B3%7D%5Cpi%20%7Br%7D%5E%7B3%7D%20" id="TexFor

uranmaximum [27]

Answer:

Volume of hemisphere=

$\frac{2}{3} \pi {r}^{3}$

Volume of sphere=

$\frac{4}{3} \pi {r}^{3}$

Step-by-step explanation:

$\frac{2}{3} \times \frac{22}{7} \times {8}^{3}$

Using calculator=

1072.761905

Round to the nearest tenth=

1072.8

5 0

3 years ago

Questions on file. Thx. Pls number questions to answer

ZanzabumX [31]

Second one
1/16
3/8 divided by 1/6=1/16

3 0

3 years ago

Read 2 more answers

What is the solution to the system? 1. x-y + 2 z = -7 2. y + z =1 3. x-2 y - 3 z = 0

kvv77 [185]

You'd find this problem easier to understand and do if you'd please list the defining equations vertically and line up variables:

1. x - 1y + 2 z = -7

2. y + 1z = 1

3. x - 2 y - 3 z = 0 Now eliminate the line numbers:

x - 1y + 2 z = -7

1y + 1 z = 1

x - 2 y - 3 z = 0

Let's use the elimination method to eliminate variable z: Seeing that z = 1 - y, we transform the first equation into 1x - 1y + 2(1-y) = -7

and the third into x - 2y - 3(1-y) = 0.

Simplifying 1x - 1y + 2(1-y) = -7

and x - 2y - 3(1-y) = 0,

we get

1x - 2y - 3 + 3y) = 0 and 1x - 1y + 2 - 2y = -7

which in turn simplify to

1x + y = 3 and 1x - 3y = -9

Having eliminated the variable z, we now focus on eliminating x. Mult. the 1st equation by -1, obtaining -1x - 1y = -3. Add this result to 1x - 3y = -9:

0 - 4y = -12, which tells us that y = 3. Subbing 3 for y in 1x + 1y = 3 tells us that x = 0.

All we have left to determine is the vaue of z.

Borrowing Equation 3, from above, we get x - 2 y - 3 z = 0, and into this equation we substitute x = 0 and y = 3: 0 -2(3) - 3z = 0.

Thus, -3z = 6, and z = -2.

The solution set is (0, 3, -2). You should check this by substitution.

3 0

4 years ago

Factor of 32 other factor is 4 what number am i

mrs_skeptik [129]

I think the answer is 8. After solving i got 8

3 0

3 years ago

Find the area of a semicircle with radius r​

Find the area of a semicircle with radius r