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3 years ago

Recap me ok area of circle the formula of

Mathematics

2 answers:

Hitman42 [59]3 years ago

7 0

Answer:

A = πr²

Step-by-step explanation:

The formula for the area of a circle is A = πr², where π is approx. 3.14159 and r is the radius of the circle.

gizmo_the_mogwai [7]3 years ago

4 0

π is 3.14. <em>r</em> is the radius of the circle.

If r = 3 then the area is 28.27.

π × 3² | Replace <em>r </em>with your circle's radius
3.14... × 9 | Solve groups
3.14... × 9 ≈ 28.27

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This question has three parts. Answer the parts in order.

nalin [4]

Answer:

The area of the smallest section is $A_{1}=100yd^{2}$

The area of the largest section is $A_{2}=625yd^{2}$

The area of the remaining section is $A_{3}=250yd^{2}$

Step-by-step explanation:

Please see the picture below.

1. First we are going to name the side of the larger square as x.

As the third section shares a side with the larger square and the four sides of a square are equal, we have the following:

- Area of the first section:

$A_{1}=10yd*10yd$

$A_{1}=100yd^{2}$

- Area of the second section:

$A_{2}=x^{2}$ (Eq.1)

- Area of the third section:

$A_{3}=width*length$

$A_{3}=10yd*x$ (Eq.2)

2. The problem says that the total area of the enclosed field is 975 square yards, and looking at the picture below, we have:

$A_{1}+A_{2}+A_{3}=975yd^{2}$

Replacing values:

$100+x^{2}+10x=975$

Solving for x:

$x^{2}+10x-875=0$

$x=\frac{-10+\sqrt{100+(4*875)}}{2}$

$x=\frac{-10+\sqrt{3600}}{2}$

$x=\frac{-10+60}{2}$

$x=25$

3. Replacing the value of x in Eq.1 and Eq.2:

- From Eq.1:

$A_{2}=25^{2}$

$A_{2}=625yd^{2}$

- From Eq.2:

$A_{3}=10*25$

$A_{3}=250yd^{2}$

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Amir walks 1/2 mile in 15 minutes. Jody walks 2/3 mile in 20 minutes. Who walks at a faster rate?

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Answer:

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