1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
swat32
2 years ago
8

Find the circumference and area of a circle with a radius 9 cm.

Mathematics
2 answers:
kobusy [5.1K]2 years ago
8 0

Your answer would be 56.52 cm (18π) for the circumference, and 254.34 cm² (81π) for the area.

The formula for the circumference of a circle is 2πr. In this case, we know that the radius is 9, so substituting it in, you get 2 * 9 * π. Solving this, we get 18π as our circumference. Your question states to use 3.14 as π, so the final step is to multiply 18 by 3.14. 18 * 3.14 = 56.52. The unit in this case would just be cm, as we are looking at circumference, or length.

The formula for the area of a circle is πr². Again, we know r = 9, so just substitute it in the equation, to get π9², which can be solved to equal 81π. Then, using 3.14 as π, we get 81 * 3.14 = 254.34 as our final answer. The unit in this case would be cm², as this is concerning area.

Hope this helps!

IrinaVladis [17]2 years ago
7 0

Answer:

C =56.52 cm

C =56.52 cm

C =56.52 cm

A =254.34 cm^2

Step-by-step explanation:

To find the circumference of a circle, we use

C = 2 * pi *r

where pi is approximated by 3.14 and r is 9

C = 2 * 3.14 *9

C =56.52 cm

To find the area of a circle, we use

A = pi *r^2

where pi is approximated by 3.14 and r is 9

A = 3.14 *9^2

A =254.34 cm^2

You might be interested in
Use the quadratic formula to solve the equation -4x^2-3x+2=0
Karolina [17]
The quadratic formula is hard to type on this 
3 (+ , -) (sqroot of 41)
---------------------------
              8
7 0
3 years ago
Read 2 more answers
1. x + 2x - 1 = 38<br> Inverse operation
Lena [83]

Answer:

x=13

Step-by-step explanation:

First, you add the x's together: 2x+x=3x

Now you have:3x-1=38

Add 1 to both sides: 3x=39

1 cancel on the left side of the equation

Divide 3 on both sides: x=39/3

3 cancels on the left side and 39 divided by 3 is 13:

x=13

Hope this helps!

6 0
2 years ago
I only have 2 more problems now
liq [111]
  
r° = 158°

s° = 180° - r° = 180° - 158° = 22°



4 0
3 years ago
What percent of 120 is 72<br> A- 86.4%<br> B- 60%<br> C- 1.67%<br> D- 0.6%
enot [183]
See the picture below

8 0
2 years ago
A scientist is conducting an experiment on two types of bacteria to determine which type will grow faster in a pool. After colle
Allushta [10]

Answer: bacteria 2

Step-by-step explanation:

Since the growth rates are modeled as : Bacteria 1: y = 4x

And Bacteria 2: y = 4x2

Where y represents the number of bacteria colonies and x represents the number of hours.

Let's plug in for the two models

By assuming x = 2 and x = 3

If x = 2

Bacteria 1 will be y = 8 and bacteria 2 will be y = 16

Based on these models, bacteria 2 is growing faster than bacteria 1 because the growth is exponential

5 0
3 years ago
Read 2 more answers
Other questions:
  • What is the answer to 6x+15=3x+8
    8·1 answer
  • Three fair coins are tossed at the same time. What is the probability that all three coins will come up heads or all will come u
    6·1 answer
  • The probability of a randomly selected car crashing during a year in a certain country is 0.04780.0478. if a family has three th
    9·1 answer
  • A customer placed an order with a bakery for cupcakes. the Baker has completed 37.5% of the order after being 81 cupcakes how ma
    13·1 answer
  • What is the range of 1/2 1/8 1/2 5/8 1/4 1/4 1/2 3/4 1/8 5/8 1/4 1/2
    12·2 answers
  • I don’t know, someone help please.
    12·1 answer
  • Your Co. collects 50% of its sales in the month of the sales, 30% of the follow month, and 20% the second month after the sale.
    5·2 answers
  • Please help me! asap!!
    9·1 answer
  • Mmmmm..... Cheeeeeeese.....
    13·2 answers
  • B. 4a’(a? – b?) and 9a’(a? – bº) LCM of this expression<br><br><br><br>​
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!