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scoray [572]
3 years ago
5

A semi circle has a radius of 5cm. What is the area of the semi circle?

Mathematics
1 answer:
azamat3 years ago
5 0
Hello!

We know that the formula for area of a circle is:

A = pi × r^2

A semi circle is half of a circle, which means that its formula would be have of a circles as well.

Formula for area of a semi circle:

A = (pi × r^2) / 2

We'll use the same formula for a semi circle, only we'll divide it by 2 since it's a half circle.

A = (pi × r^2) / 2

A = (3.14 × r^2) / 2

A = 78.5 / 2

A = 39.25

ANSWER:

The area of the semi circle is C.) 39.25 centimetres squared.
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Answer:

When Jon determined A(12), it means he must have found the amount in the account after 12 years. i.e. the amount when t = 12 years.

Hence, option (A) is true.

Step-by-step explanation:

<u><em>BACKGROUND KNOWLEDGE ABOUT EXPONENTIAL GROWTH</em></u>

We know that an exponential increase in Math can be termed as the rapid increase of an amount by percentage over a certain period of time.

It can be expressed using the formula

y = a (1+b)ˣ

here

y represents the final amount

a represents the original amount

b represents the growth factor

x represents the time that has passed

Now, let is us map our problem because it indicates the same concept.

<em><u>SOLVING THE QUESTION</u></em>

Given the function

A\left(t\right)=2000\left(1+0.0412\right)^{12t}

Here

A(t) represents the final amount

2000 represents the original amount

0.0412 represents the growth rate

t represents the number of years

Thus,

When Jon determined A(12), it means he must have found the amount in the account after 12 years. i.e. the amount when t = 12 years.

Hence, option (A) is true.

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2 years ago
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Step-by-step explanation:

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