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1 year ago

How do I find the surface area of the hemisphere in terms of pi??

Mathematics

1 answer:

oee [108]1 year ago

5 0

Formula of surface area (SA) of an hemisphere:

$SA=2\pi r^2$

where r represents the radius of the hemisphere.

In the image, we are given the radius, r = 8 cm. Then, we just have ot replace this value in the formula and solve:

$SA=2\pi(8)^2$

Simplifying:

$SA=2\pi\cdot(64)$ $SA=128\pi$

Answer: 120π cm²

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4 years ago

In order to join a flying club,there is a $200 annual fee and $20 a month fee to maintain the flying club runaway.Write an equat

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Answer:

The equation modelling the situation is $T=200+20m$ .

After 10 months the cost would be $400.

Step-by-step explanation:

Given:

Annual Fee of flying club = $200

Monthly fee = $20

We need to write an equation for total cost.

Solution:

Let the number of months be denoted 'm'

Let Total cost be denoted by 'T'

Now we can say that:

Total cost is equal to sum of Annual Fee of flying club plus Monthly fee multiplied by number of months.

framing in equation form we get;

$T=200+20m$

Hence The equation modelling the situation is $T=200+20m$ .

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So we will substitute T= 400 in above equation.

$200+20m=400$

Subtracting both side by 200 we get;

$200+20m-200=400-200\\\\20m=200$

Dividing both side by 20 we get;

$\frac{20m}{20}=\frac{200}{20}\\\\m=10 \ months$

Hence After 10 months the cost would be $400.

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3 years ago