All categories

3 years ago

Calculate the length of the circumference of a circle with diameter of 9cm

1 answer:

8 0

Hello!

We must use a certain formula to find the circumference of a circle. The formula is:

C = 2 × pi × r

We have the diameter of the circle, so we'll be able to find its radius, since radius is always half the diameter.

r = d ÷ 2

r = 9 ÷ 2

r = 4.5

So, the radius of the circle is 4.5 centimetres. Pi equals approximately 3.14. Substitute:

C = 2 × 3.14 × 4.5

C = 6.28 × 4.5

C = 28.26

ANSWER:

The circumference of the circle is 28.26 centimetres long.

You might be interested in

Consider a square and a regular hexagon (a six-sided figure with sides of equal length). One side of the square is 25 feet longe

VARVARA [1.3K]

Square side length=75
Hexagon side length=50

4 0

3 years ago

Which graph represents exponential decay? On a coordinate plane, a straight line has a negative slope. On a coordinate plane, a

RoseWind [281]

Answer:

The correct option is (C).

Step-by-step explanation:

The exponential function representing decay is as follows:

$y=y_{0}\cdot e^{kt};\ k$

Here,

y = final value

y₀ = initial value

k = growth rate

t = time passed

The graph represents exponential decay is:

"On a coordinate plane, a graph approaches y = 0 in quadrant 1 and curves up into quadrant 2."

Thus, the correct option is (C).

3 0

3 years ago

Read 2 more answers

Solomon has read 1/3 of his book. He finishes the book by reading the same amount each night for 5 nights. A. What fraction of t

Tatiana [17]

A) 2/3 divided by 5/1
= 2/3 X 1/5
= 2/15 of the book

B) 14X5=70
1/3
2/3
3/3
70+35= 105 pages

4 0

3 years ago

Carl Brownstein is a golf course groundkeeper whose annual gross pay is $45,500. He has exemptions of $3,000. The tax state on t

zhenek [66]

Answer:

Step-by-step explanation:

7 0

3 years ago

To factor 9x^2 - 4, you can first rewrite the expression as:

olga2289 [7]

Answer:

C. (3x)^2 - (2)^2

Step-by-step explanation:

Each of the two terms is a perfect square, so the factorization is that of the difference of squares. Rewriting the expression to ...

(3x)^2 - (2)^2

highlights the squares being differenced.

We know the factoring of the difference of squares is ...

a^2 -b^2 = (a -b)(a +b)

so the above-suggested rewrite is useful for identifying 'a' and 'b'.

4 0

3 years ago