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2 years ago

What is the exact area of a circle having diameter 4 in.?

Mathematics

2 answers:

Dominik [7]2 years ago

7 0

R = d/2 = 4/2 = 2 in

A = π r^2 = π (2)^2 = 4π

answer
4π in^2

andrezito [222]2 years ago

3 0

The exact area is 12.56 in.

First, consider the formula for the area of a circle, which is A=πr². The radius is half of the diameter, so if the diameter is 4 the radius is 2.

A=πr²
A=π2²
A=π4
A=3.14*4
A=12.56

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Read 2 more answers

Can someone please help me factor this

Dmitry_Shevchenko [17]

Answer:

$\huge\boxed{\bf\:1}$

Step-by-step explanation:

$\frac{ x ^ { 2 } -4x+3 }{ x ^ { 2 } -7x+12 } \times \frac{ x ^ { 2 } +2x-24 }{ x ^ { 2 } +5x-6 } ^ { }$

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$\frac{ x ^ { 2 } -4x+3 }{ x ^ { 2 } -7x+12 } \\= \frac{\left(x-3\right)\left(x-1\right)}{\left(x-4\right)\left(x-3\right)}\\= \frac{x-1}{x-4}$

Now factorise the next set : $\frac{ x ^ { 2 } +2x-24 }{ x ^ { 2 } +5x-6 } ^ { }$ .

$\frac{ x ^ { 2 } +2x-24 }{ x ^ { 2 } +5x-6 } ^ { }\\= \frac{\left(x-4\right)\left(x+6\right)}{\left(x-1\right)\left(x+6\right)}\\= \frac{x-4}{x-1}$

Now, multiply the two simplified results.

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$\rule{150pt}{2pt}$

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1 year ago

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vladimir2022 [97]

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2 years ago

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Illusion [34]

Percent of decrease :
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