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3 years ago

What is the area of a circle

Mathematics

1 answer:

ladessa [460]3 years ago

7 0

Answer:

π $r^{2}$

Step-by-step explanation:

You would find the square of the radius (radius x radius), then multiply this by pi, or substitute the radius length into the equation where it says 'r', then type this into your calculator.

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What’s ( -13x- 15 ) - ( -9x + 16 )

Tasya [4]

Answer:

-4x-31

Step-by-step explanation:

1) Distribute:

(-13x-15)+(9x-16)

2) Eliminate parenthesis that are not useful:

-13x-15+9x-16

3) Subtract the numbers:

-13x-31+9x

4) Combine like terms:

-4x-31

Hope this helped!

3 0

3 years ago

A central angle theta in a circle of radius 7 m is subtended by an arc of length 8 m. Find the measure of theta in degrees. (Rou

gogolik [260]

Answer: In degrees , The measure of $\theta=65.5^{\circ}$

In radians , the measure of $\theta =\dfrac{8}{7}\text{ radians}$ .

Step-by-step explanation:

We know that the formula for length of arc is given by :-

$l=\theta r$

, where $\theta$ = Central angle subtended by arc.

r= radius of the circle.

As per given , we have

Radius of circle : r=7 m

Length of arc : l= 8 m

Substitute these values in the above formula , we get

$8=\theta (7)\\\\\Rightarrow\ \theta =\dfrac{8}{7}\text{ radians}$

Hence, the measure of $\theta =\dfrac{8}{7}\text{ radians}$ .

To convert it into degrees we multiply it with $\dfrac{180^{\circ}}{\pi}$

The measure of $\theta =\dfrac{8}{7}\times\dfrac{180^{\circ}}{\pi}$

$=(\dfrac{8\times180}{7\times3.14})^{\circ}=65.5141037307^{\circ}$

$\approx65.5^{\circ}$

Hence, the measure of $\theta=65.5^{\circ}$

8 0

4 years ago

Shawna reduced the size of a rectangle to a height of 2 in. What is the new width if it was originally 24 in wide and 12 in tall

miskamm [114]

Answer:

4 inches.

Step-by-step explanation:

The height of a rectangle is reduced by Shawna to a size of 2 inches.

The original width of the rectangle was 24 inches and the height was 12 inches.

If the ratio of width to height remains the same, then we can find the new width.

If the new width is x inches then, we can write

$\frac{x}{2} = \frac{24}{12}$

⇒ x = 4 inches. (Answer)

7 0

2 years ago

Read 2 more answers

PLEASE HELP ASAPPP!!!!!!!!!!!!!!!

Pani-rosa [81]

You need to multiply 13.4 by 5,880,000,000,000.
First, we change both numbers into scientific notation.

13.4 = 1.34 * 10^1
5,880,000,000,000 = 5.88 * 10^12

Now we multiply the numbers written in scientific notation.

1.34 * 10^1 * 5.88 * 10^12 =

= 7.8792 * 10^13

The answer is choice A.

4 0

3 years ago

Read 2 more answers

The length of a rectangle is 6 cm less than twice its width. Find the dimensions of the rectangle if its areais 108cm

valentinak56 [21]

L=2w-6

area = L x W

108=(2w-6)w

108 = 2w^2-6w

2w^2-6w-108 = 0

2(w^2-3w-54)=0

2(w-9)(w+6) = 0

w=9

L= 2(9)-6 = 12

12*9 = 108

3 0

4 years ago