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user100 [1]
3 years ago
10

Calculate the area of a circle with a radius of 2 cm and a circle with a radius of 4 cm. Leave your answers in terms of pi.

Mathematics
1 answer:
galina1969 [7]3 years ago
6 0
S = πr^<span>2
</span>so area of circle where r is 2cm;π=3,14 will be 
S = π*(2^2)
S=π*4
S=4π  cm2

S = πr^2
so circle  where r is 4cm;π=3,14 will be 
S = π*(4^2)
S=π*16
S=16π  cm2


the answer for second question is thet the area gets bigger 4 times if we double radius)so "yes"

ANSWER IS 
<span>C) 4π cm2; 16π cm2; YES </span>
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The length of a rectangle is 17 m and the width is 12 m what is the perimeter of the rectangle
lbvjy [14]

Answer:

<h2>The answer is 58 m</h2>

Step-by-step explanation:

Perimeter of a rectangle = 2l + 2w

where

l is the length

w is the width

From the question

length = 17 m

width = 12 m

Substitute the values into the above formula and solve for the perimeter

We have

Perimeter = 2(17) + 2(12)

= 34 + 24

We have the final answer as

<h3>58 m</h3>

Hope this helps you

5 0
2 years ago
hile sitting in physics class one day, you begin to ponder the workings of the analog clock on the classroom wall. You notice as
PSYCHO15rus [73]

Answer:

Second hand will turn through 74π radians.

Step-by-step explanation:

There are 37 minutes left in the class. We need to find by how much angle will the second hand turn before the end of the class.

When a second hand completes one full rotation along the clock it covers 360 degrees and completes 60 seconds.

This means:

In 60 seconds, the second hand turns by 360 degrees

Since, 60 seconds = 1 minute, we can write:

In 1 minute, the second hand turns = 360 degrees

360 degrees is equal to 2π radians. So,

In 1 minute, the second hand turns = 2π radians

Multiplying both sides by 37 gives us:

In 37 minutes, the second turns = 2π radians x 37 = 74π radians

8 0
3 years ago
Instructions: Use the ratio of a 30-60-90 triangle to solve for the variables.
Pepsi [2]

Answer:

x=20

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Step-by-step explanation:

In the triangle we have the following trigonometric equations:

tan(60^o)=\frac{opposite}{adjacent} \\\sqrt{3} =\frac{y}{10} \\y=10\,\sqrt{3}

and also:

cos(60^o)=\frac{adjacent}{hypotenuse}\\\frac{1}{2} =\frac{10}{x}\\x=20

8 0
3 years ago
I broke my laptop sorry about the spots
Sergeu [11.5K]

Answer: 3x^2-x+3

Step-by-step explanation:

(4x^2-x+6)-(x^2+3)

Distribute the negative sign. This basically changes all the signs inside the parentheses.

4x^2-x+6-x^2-3

Combine like terms;

3x^2-x+3

7 0
2 years ago
5) A cab driver uses 36 gallons of gas in driving 529.2 miles. Find the
Sati [7]

Answer:

14.7 miles per gallon

Step-by-step explanation:

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Read 2 more answers
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