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3 years ago

I don't understand how to find the area of a circle

Mathematics

2 answers:

Liula [17]3 years ago

6 0

You have to find out the radius of the circle so u have to find it in the middle of the circle

Darina [25.2K]3 years ago

6 0

Area of a circle is calculated by this expression....

A = πR²

What this says is Area is equal to the radius squared times pi (3.14 for all intensive purposes.)

So, we need to find A (area.)

We know the diameter (d) is twice the radius, and we know that the diameter is 10.

10/2 = 5.

The radius is 5.

A = π5²

5² = 5 x 5 = 25

A = π25

3.14 (π) * 25 = 78.5

The area of the circle with the diameter of 10 is 78.5 roughly. This is not exact but for what you are doing it will suffice.

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Given f(x) = -3x - 2 find the foloeing

emmainna [20.7K]

Answer:

f(x) = -3x - 2

F(0)=-2

F(1)= -5

Domain R

Range R

Step-by-step explanation:

6 0

3 years ago

Can someone explain me how do i do (ii)?

Varvara68 [4.7K]

Answer:

(only ii right?)

Since we have the total number is 360° and our section is 72°, we know that the percentage of students who choose the cinema should be the number that we have divided to the total amount and then multiply the result by 100 ( it's fine if you write 100%, but when you actually calculate it, it's only 100, not 100%):

(72/360) . 100 = 20%

6 0

4 years ago

Machine A produces bolts at a uniform rate of 120 every 40 seconds, and Machine B produces bolts at a uniform rate of 100 every

Nutka1998 [239]

Answer:

25 seconds

Step-by-step explanation:

Hi there!

In order to answer this question, first we need to know how many bolts per second are produced by each machine, this can be known by dividing the number of bolts by the time it takes.

For machine A:

$A = \frac{120 bolts}{40 s}= 3 \frac{bolts}{s}$

For machine B:

$B = \frac{100 bolts}{20 s}= 5 \frac{bolts}{s}$

So, if the two machines run simultaneously, we will have a rate of prodcution of bolts equal to the sum of both:

$A+B=(3+5)\frac{bolts}{s}=8\frac{bolts}{s}$

Now, we need to know how much time it will take to producee 200 bolts, to find this out we need to divide the amount of bolts by the production rate:

$t = \frac{bolts}{ProductionRate}= \frac{200 bolts}{8 \frac{bolts}{s} }$

The <em>bolts</em> unit cancell each other and we are left with <em>seconds</em>

$t = \frac{200}{8} s = 25 s$

So it will take 25 seconds to produce 200 bolts with machine A and B running simultaneously.

Greetings!

4 0

4 years ago

Read 2 more answers

You need to cover the playground of a child development center with mulch. the playground is 125 feet long and 60 feet wide. you

kirill [66]

The answer is 139 cubic yards

This mulch will be of cylindrical shape.
The volume (V) of a cylinder is:
V = l · w · h (l - length, w - width, h - height (in our example, height = depth)

It is known:
l = 125 feet
w = 60 feet
h = 6 inches = 0.5 feet

V = l · w · h = 125 · 60 · 0.5 = 3750 feet³

Since 1 cubic foot is 0.037 cubic yards, 3750 cubic feet are 139 cubic yards:
0.037 · 3750 feet³ = 138.75 cubic yards ≈ 139 cubic yards

4 0

3 years ago

Tpy6a [65]

Answer:

angle abc=125°

.......................

6 0

3 years ago

Read 2 more answers