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Fynjy0 [20]
4 years ago
13

What is the circumference

Mathematics
1 answer:
Stolb23 [73]4 years ago
6 0
There are two (equivalent) formulas for the circumference of a circle:

C = 2 pi r, where r is the radius of the circle

C = pi d, where d is the diameter of the circle

In this particular problem, however, we're dealing with arc length.  For the shown central angle "theta" = 160 degrees, the arc length is 42 cm.
Knowing this enables us to calculate the radius or diameter of the circle.

Arc length = s = (radius) (central angle, in radians, not degrees)

First, convert 160 degrees to radians:  160 deg     pi rad
                                                              ----------- * ------------ = (8/9) pi rad
                                                                    1         180 deg

Then 42 cm =  r *(8/9) pi rad

Solve for the radius (r):  divide 42 cm by (8/9) pi rad

Then use the formula for circumference introduced earlier:

C= 2 pi r                   Substitute [42 cm / ( (8/9) pi rad )] for r.

Simplify your result, and you will then have the circumference, C, in cm.
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May I have help on question 13 read The question and Then give Me The answer
GalinKa [24]

Answer:

420 miles

Step-by-step explanation:

you have to subtract the initial cost of the car from $270. That leaves you with $210 remaining to spend on mileage. At a rate of 50 cents per mile you have to determine how many miles it would take to spend $210. At a rate of $1 per mile it would take 210 miles to spend $210 dollars. BUt since each mile is 50 cents and it takes .50 times 2 to make 1, you have the multiply 210 by 2 which equals 420.

3 0
3 years ago
Sandra wants to buy a new mp3 player that is on sale for $95 she has saved $73 how much more money does she need
Schach [20]

Answer:

For Sandra to save up and purchase the mp3 she must save additional $22.

Step-by-step explanation:

This problem requires us to understand the concerns of deficit/balance

Step one

We were told that mp3 cost $95

And Sandra has saved $73

Hence for her to purchase the mp3 she has to save up to $95 which is the benchmark price for the item

Step two :

Hence the amount of money to balance up is

=Cost of mp3- Sandra's savings

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5 0
3 years ago
Read 2 more answers
Find 6.75% of 260 plzzzzzzzzzzzzzzzzzzzzzzzzzzzz helppppppppppppppp
ICE Princess25 [194]

Answer:

17.55

Step-by-step explanation:

. We assume, that the number 260 is 100% - because it's the output value of the task.

2. We assume, that x is the value we are looking for.

3. If 260 is 100%, so we can write it down as 260=100%.

4. We know, that x is 6.75% of the output value, so we can write it down as x=6.75%.

5. Now we have two simple equations:

1) 260=100%

2) x=6.75%

where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

260/x=100%/6.75%

6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 6.75% of 260

260/x=100/6.75

(260/x)*x=(100/6.75)*x       - we multiply both sides of the equation by x

260=14.814814814815*x       - we divide both sides of the equation by (14.814814814815) to get x

260/14.814814814815=x

17.55=x

x=17.55

now we have:

6.75% of 260=17.55

8 0
4 years ago
Read 2 more answers
felicia went out to dinner with friends. when the check came, she said she would pay the tip. the tip was 10 percent of the tota
kiruha [24]

Answer:

$2.20

Step-by-step explanation:

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5 0
3 years ago
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andrezito [222]

Answer:

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Step-by-step explanation:

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