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Lisa [10]
3 years ago
7

Help ASAP!!

Mathematics
2 answers:
Aleksandr [31]3 years ago
5 0

Circumference of a circle - derivation

This page describes how to derive the formula for the circumference of a circle.

Recall that the definition of pi (π) is the circumference c of any circle divided by its diameter d. Put as an equation, pi is defined as

π

=

c

d

Rearranging this to solve for c we get

c

=

π

d

The diameter of a circle is twice its radius, so substituting 2r for d

c

=

2

π

r

If you know the area

Recall that the area of a circle is given by

area

=

π

r

2

Solving this for r

r

2

=

a

π

So

r

=

√

a

π

The circumference c of a circle is

c

=

2

π

r

DENIUS [597]3 years ago
4 0

Answer:

4.)  Find the length of the diameter and the length of the circumference of the circle. Divide the length of the circumference by the length of the diameter. Set up an equation showing the ratio of the circumference to the diameter equal to ​ π ​. Then rearrange the equation by solving it for the circumference. Substitute 2 times the radius for the diameter.

Step-by-step explanation:

I know I just took the quiz

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The length of a rectangle is 6 ft longer than its width.
nasty-shy [4]

Answer:

135ft²

Step-by-step explanation:

Width = w

Length = w + 6

Perimeter = 48

Perimeter = 2(l + w)

Perimeter = 2(w + 6 + w) = 48

2(2w + 6) = 48

4w + 12 = 48

4w = 48 - 12

4w = 36

w = 36/4

width = 9

length = w + 6 = 9 + 6 = 15

Area = length × width

= 15 × 9

= 135 ft²

4 0
1 year ago
Read 2 more answers
Please help a kid out
Vlad1618 [11]

15/24

4 2/3=(4*3)+2/3=14/3

simply 15/24

15/3/24/3=5/8

refine

5/8*14/3

8 and 14 share a factor of 2

8/2=4

14/2=7

refine

5/4*7/3

5*7/4*3

35/12

convert to mixed number

35/12=2.11

2 11/12

the answer is 2 11/12

7 0
3 years ago
Mrs. Williamson had 18 students in her homeroom at the beginning of the school year and 24 students at the end of the year. What
jarptica [38.1K]

Answer:

25%

Step-by-step explanation:

An easy way to figure this out is just by dividing the initial amount of students (18) by the current amount of students (24), and then subtracting 1.

So, 18/24 = 0.75 (aka 75%), and  1 - 0.75 = 0.25 (aka 25%)

7 0
2 years ago
What property describes the number sentence 6+0=6
sergejj [24]
Additive identity because that is the property when you add something to 0 and get the same thing
6 0
3 years ago
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HELP ASAP PLEASE idjfjdjejf
gregori [183]

Answer: 35 apples are ripe and rest i.e 21 apples are not.

Step-by-step explanation:

5/8 of 56 apples are ripe i.e 35 apples are ripe and the rest 56-35 apples are not.

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3 0
2 years ago
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