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
Sholpan [36]
3 years ago
5

4. What is the circumference of a circle whose area is 81π cm squared?

Mathematics
2 answers:
vichka [17]3 years ago
7 0
Area = pi*r^2
Circumference = 2pi*r

Step 1: find the radius from area
81pi=pi*r^2
81=r^2
9=r

Step 2: plug in radius to the circumference equation

Circumference = 2pi*r

18pi is the answer, otherwise know as 56.52 as well.
pogonyaev3 years ago
3 0

Step-by-step explanation:

Let us assume R be the radius of circle We know that, area of circle = πR2 81πr2 = πR2 R = √81 r R = 9r Circumference = 2 πr = 2 π (9r) = 18πr

You might be interested in
PLEASE HELP PLEASE WILL GIVE BRAINILIEST 5 STARS AND THANK YOU TO WHOEVER CAN HELP!
Mnenie [13.5K]
Ok so the lines with two triangles are parralel to eachother. The lines with one are parallel to eachother.

The angle of 109° and angle of z° equal eachother. Z=109°

Since 109°, 33° and y° form a triangle, the sum of the angles will equal 180. Add 109 and 33 to get 142. Subtract 142 from 180 to get y°=38°.

Since z=109, this means that the triangle is congruent with the other. Since the congruent triangles are in a rhombus, then the angles are flipped. Thus, angle x =33°.

z=109°
y=38°
x=33°
3 0
3 years ago
PLEASE HELP ME IM BEGGING YOU!!!<br> FIND THE VALUE OF X
Korvikt [17]

84 I'm sure it's that I did it before

8 0
3 years ago
Read 2 more answers
3 yards of ribbon can be purchased for $10. How many yards can $5 purchase.
Stells [14]

Answer:

1.5 yards

Step-by-step explanation:

5 is half of 10

half of 3 is 1.5

I hope this helped and if it did I would appreciate it if you marked me Brainliest. Thank you and have a nice day!

6 0
2 years ago
6. If the average temperature in February was 55°F arch was 64°F April was 74°F, and Ma was 85°F men which month had the smalles
mylen [45]
The month of February has the smallest gain in average temperature over the previous month?????
3 0
3 years ago
Triangle congruence<br> Which statements are true? Select all that apply.
NISA [10]
All but c are correct so the answer is a b and d
5 0
2 years ago
Other questions:
  • Terry has $2.30 can she buy for pencils that cost $.49 each
    10·2 answers
  • The reputation of many businesses can be severely damaged due to a large number of defective items during shipment. suppose 300
    15·1 answer
  • A local bookstore finds that each day approximately 20% of their sales are nonfiction books if they sell 425 books one day how m
    15·1 answer
  • A manufacturer produces two types of bottled coffee drinks: cappuccinos and cafés au lait. Each bottle of cappuccino requires 6
    9·2 answers
  • Which gragh shows the solution to the following system of inequalities?
    9·1 answer
  • Hey! can u help me with this?! 6 divided by 3/5 in fraction form!?!?!!?
    15·2 answers
  • Each day, Deanne starts working at 10:00 a.m. and Stephanie starts working at noon. At which time each day are the earnings for
    13·1 answer
  • Question<br> Example<br> Step by Step<br> In kite ABCD, mZBAE = 28° and mZBCE = 58°. Find mLABE.
    9·1 answer
  • Find the next three terms in each geometric sequence. -4, 16, -64, ...
    5·1 answer
  • Bashir deposits money into a savings account every year. In his first year of saving money, he deposited $1,500.
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!