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Sladkaya [172]
3 years ago
13

By what percentage must the diameter of a circle be increased to increase its area by 50%?

Mathematics
2 answers:
Ksju [112]3 years ago
7 0
The area is to be increased by 50%.

Area of the circle is given by: A = πr²

New Area = A' = A + 50% of A = 1.5 A 
Let the new radius be R.

So, we can say:

A' = πR² = 1.5 πr²
⇒

R² = 1.5r²
⇒
R = √1.5 r

This shows that the radius must be increased to square root of 1.5 times to increase the Area by 50%.

Diameter is the twice of radius, so the change in diameter will also be the same i.e square root of 1.5 times.

So, diameter must be made 1.225 times. In percentage this can expressed as 22.5%.

Hence, the answer to this question is 22.5%
katovenus [111]3 years ago
5 0
The circle increase in area will be by a factor of 1.5
So corresponding increase in the diameter will be a factor of  sqrt 1.5 = 1.2247

Answer is 22.47 %
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2 years ago
Which expression represents a number that is four times as large as the sum of 8 and 160?
DedPeter [7]
ANSWER: x = 4 ( 8 + 160 )

STEP BY STEP:

Let's start by getting a variable to represent the number. Let's use x. ⇩

x=

Now we know that there is a sum of 8 and 160. Let's add them to each other ⇩

x= 8 + 160

Now we know that this will be multiplied. Let's put parentheses around the addition to symbolize this.

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Finally multiply this by four, making your equation

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I don't know the options but from looking at the problem I'm assuming the answer is
x = 4 ( 8 + 160 )

8 0
3 years ago
Help pls 50 points rewarded
dangina [55]

-4x+11y=15

x=2y

-4*2y+11y=15

x=2y

-8y+11y=15

x=2y

3y=15 //3

x=2y

y=5

x=2*5

y=5

x=10

x=10

y=5

5 0
3 years ago
Read 2 more answers
Can you simplify 61/35
saw5 [17]
No. 61 is an odd number not divisible
8 0
2 years ago
Read 2 more answers
PLEASE HELP ASAP!!!
Elan Coil [88]

Answer:

The number is 5

Step-by-step explanation:

6+3n = 5n-4

Subtract 3n from each side

6+3n-3n = 5n-3n-4

6 = 2n-4

Add 4 to each side

6+4 = 2n-4+4

10= 2n

Divide by 2

10/2 =2n/2

5=n

6 0
3 years ago
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