All categories

3 years ago

What is the circumference of a circle with a diameter of 21cm, rounded to the nearest tenth

Mathematics

2 answers:

vagabundo [1.1K]3 years ago

8 0

65.9 cm

Step-by-step explanation:

The formula for the circumference of a circle is...

$C=\pi d$

Since the problem asks to round to the nearest tenth, we know that we will convert pi to 3.14. We also know the diameter is 21, so we can put both of these in the formula.

$C=3.14*21$

C = 65.940

Rounded to the nearest tenth...

C = 65.9 cm

otez555 [7]3 years ago

7 0

Answer:

Step-by-step explanation:

22/7 * 21 = 66cm

You might be interested in

Select the correct answer.

Ierofanga [76]

Answer:

$19.2x+96$ units

Step-by-step explanation:

The perimeter of a square is 4 times the length of one side.

The length of the sides of a square is given by the expression $4.8x+24$

To find the perimeter, we multiply this expression by 4.

$Perimeter=4(4.8x+24)$

We expand to obtain:

$Perimeter=4*4.8x+4*24$

This simplifies to:

$Perimeter=19.2x+96$

7 0

3 years ago

One number is six times as large as another. The sum of their reciprocal is 7. What are the numbers

RideAnS [48]

X=6y

sum of their reciprocals
(1/x)+(1/y)=7
x=6y
1/6y+1/y=7
1/6y+6/6y=7
7/6y=7
times both sides by 6y
7=42y
divide both sides by 42
1/6=y

x=6y
x=6(1/6)
x=6/6
x=1

the numbers are 1 and 1/6

5 0

3 years ago

Arjun has to stick by his budget. his salary is $112,000 after taxes. he divides his

geniusboy [140]

I hope this helps you :)

6 0

3 years ago

What two numbers have a sum of 217 and a difference of 85?

KiRa [710]

We can use the system of equations:x + y = 217x - y = 85-----------------From the 2nd equation: y = x - 85x + x - 85 = 2172 x = 217 + 852 x = 302x = 302 : 2x = 151y = 217 - 151y = 66We can prove this solution:151 + 66 = 2017 and 151 - 66 = 85.Answer: those numbers are 151 and 66.

3 0

3 years ago

Set C is the set of two-digit even numbers greater than 34 that are divisible by 5 C=

amid [387]

In order for it to be divisible by 5 AND be an even number, it must also be divisible by 2. So you are looking for two-digit numbers greater than 34 and divisible by 10:
C = {40, 50, 60, 70, 80, 90}

8 0

4 years ago

What is the circumference of a circle with a diameter of 21cm, rounded to the nearest tenth​

What is the circumference of a circle with a diameter of 21cm, rounded to the nearest tenth