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
Julli [10]
3 years ago
13

A sector of a circle of radius "r" cm has an area of "A"cm². Express the perimeter of the sector in terms of "r" and "A"

Mathematics
1 answer:
Andrews [41]3 years ago
6 0

Answer:

2A/r + 2r

Step-by-step explanation:

A sector is made of an arc and two radii. As such, the perimeter of the sector is the sum of the length of an arc and the two radii. Given that the radius is r and the area is A, the area of a sector A

= Ф°/360° * πr²

The length L of an arc of the sector

= Ф°/360° * 2πr

Hence,

A/L = r/2

L = 2A/r

The perimeter of the sector

= L + 2r

= 2A/r + 2r

You might be interested in
The score on a trivia game is obtained by subtracting the number of incorrect answers from twice the number of correct answers.
guajiro [1.7K]

Answer: the player answered 30 questions correctly.

Step-by-step explanation:

Let x represent the number of questions that the player answered correctly.

Let y represent the number of questions that the player answered incorrectly.

The number of questions that the player answered is 40. It means that

x + y = 40- - - - - - - - - - -1

The score on the trivia game is obtained by subtracting the number of incorrect answers from twice the number of correct answers. If the player obtained a score of 50, It means that

2x - y = 50

y = 2x - 50

Substituting y = 2x - 50 into equation 1, it becomes

x + 2x - 50 = 40

3x - 50 = 40

3x = 40 + 50 = 90

x = 90/3

x = 30

5 0
3 years ago
Solve 5x − 4 = 7 for x using the change of base formula log base b of y equals log y over log b.
Sauron [17]

Answer:

5.209 or A

Step-by-step explanation

5^x-4=7

reserve 4

log sides

x-4 log5 and log7  

x-4=log7/log5

+4 or number of your equation

x=log5/log7 +4

use calculator

get answer

5.209

EDIT: Got a 100 on the test this is correct

5 0
2 years ago
Help i don't understand this.
Arte-miy333 [17]

Answer:

7/23

Step-by-step explanation:

There seven black socks and all of the socks together is 23.

4 0
3 years ago
Can somebody please help me out ?
Sever21 [200]

Answer:

30

Step-by-step explanation:

238,900/7,917=30.1755

7 0
2 years ago
Read 2 more answers
Pls help with this function<br> Emergency
Alborosie

Answer:

rational function is the correct answer

5 0
2 years ago
Other questions:
  • Whats a quadratic equation that has the roots of 6 and negative 9
    13·1 answer
  • Andre types 208 words in 4 minutes. Noah types 342 words in 6 minutes. Who types faster?
    13·1 answer
  • at a particular school 40% of children travel by bus if this represents 400 children, how many children attend the school
    10·2 answers
  • If the correlation between height and weight of a large group of people is 0.75​, find the coefficient of determination​ (as a​
    10·2 answers
  • 2(n + 17) /8 = 3/8<br><br> PLS HELP I WILL GIVE BRAINLY!
    8·1 answer
  • Tell what the value of each point would be if​
    7·1 answer
  • Use the distributive property to expand the following expression.<br><br><br> 2{2.1 x + 3y 1.8}
    8·2 answers
  • Write the equation of a line that is parallel to y = -5/4x+ + 7 and that passes through the point (-4,1).
    12·1 answer
  • What charge is the neutron?<br> Katlyn-charged<br> negative<br> no charge (neutral)<br> positive
    15·1 answer
  • What percent of 50 is 7
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!