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3 years ago

What is the radius of

Mathematics

2 answers:

AfilCa [17]3 years ago

6 0

Answer:

143.31

Step-by-step explanation:

*C=2πr*

C=circumference

r=Radius

π=3.14

r=C/2π

r=900/2π

r=900/6.28

r=143.31

Ulleksa [173]3 years ago

3 0

Answer:

143.2 yards

Step-by-step explanation:

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The three lines 8x+3y=12, 6y-7x=24, x+9y+33=0 intersect to form a triangle. Find the coordinates of its centroid

kicyunya [14]

Answer:

coordinates of its centroid=(-1,-1)

Step-by-step explanation:

The given three lines are:

8x+3y=12, (1)

6y-7x=24 (2)

and x+9y+33. (3)

Multiplying equation (1) by 2 and subtract the equation (2), we get

23x=0⇒x=0,

Putting the value of x=0 in equation (2), we get

6y=24

y=4

Now, multiply the first equation by 3 and subtract the equation (3), we get

23x=69⇒x=3

Putting the value of x=3 in equation (1), we get

24+3y=12

3y=-12

y=-4

Also, multiplying the equation (3) by 7 and add the equation (2), we get

69y=-207

y=-3

Putting the value of y=-3 in equation (2), we get

6(-3)-7x=24

-18-24=7x

x=-6

So the centroid is located at (the average of the three vertices):

$x=\frac{0+3-6}{3}=\frac{-3}{3}=-1$ and $y=\frac{4-4-3}{3}=\frac{-3}{3}=-1$ .

Thus, the coordinates of its centroid=(-1,-1)

3 0

2 years ago

What is the perimeter of a polygon with vertices at (−2, 1) , (−2, 7) , (1, 11) , (4, 7) , and (4, 1) ?

Sholpan [36]

Each edge is given by the distance formula, which is the Pythagorean Theorem. When one of the coordinates is the same, we can shortcut that.

A(−2, 1) , B(−2, 7), C(1, 11), D(4, 7), E(4, 1)

$AB=7-1=6$

$BC=\sqrt{(1 - -2)^2 + (11-7)^2}=5$

$CD=\sqrt{(4 - 1 )^2 + (11-7)^2}=5$

$DE=7-1=6$

$EA= 4 - -2 = 6$

$\textrm{perimeter} = 6+5+5+6+6=28$

Answer: 28

7 0

3 years ago

I will give brainly but please show how you got the answer when you answer the questions

Angelina_Jolie [31]

Answer: point C = (3.75, 1.5)

Step-by-step explanation:

As the direction of the distance is from A to B, we need to down the y-axis and along (to the right) the x-axis.

Find the distance between the x-coordinates of both points by subtracting the x-coordinate of A from the x-coordinate of B:

5 - 0 = 5

3/4 of the length of this distance = 0.75 x 5 = 3.75

So the x-coordinate of C will be the sum of the distance (3.75) and the x-coordinate of A (as we are "travelling" from A to B):

3.75 + 0 = 3.75

Find the distance between the y-coordinates of both points by subtracting the y-coordinate of B from the y-coordinate of A:

3 - 1 = 2

3/4 of the length of this distance = 0.75 x 2 = 1.5

So the y-coordinate of C will be the y-coordinate of A minus the distance (1.5):

3 - 1.5 = 1.5

Therefore, point C = (3.75, 1.5)

Hope that helps - i dont know what u meant by option 1,2,3 so if u have an questions or i did it wrong i will fix it <3

3 0

2 years ago

So, here’s a math question for you: Suppose you set your confidence level at "I think I know it," which means that you’re initia

stiks02 [169]

Answer:

The answer is 20 points

Step-by-step explanation:

If the points is based on 100 by rating, and your confidence level of 'I think I know it' places you on the initial risk of 80 points as suggested, which eventually places you on the wrong side, you will be left with the following:

Total rating point of 100 minus initial risking points of 80. This leaves you with a second chance points of just 20.

6 0

3 years ago

2.5 What is the difference between relational understanding and instrumental

Afina-wow [57]

Answer:

Instrumental understanding – having a mathematical rule and being able to apply and manipulate it. Relational understanding – having a mathematical rule, knowing how to use it AND knowing why it works.

Step-by-step explanation:

Instrumental understanding involves “memorising which problems a method works for and which not, and also learning a different method for each new class of problems” (Skemp 1987, p. 159), is a desire to know “some kind of rule for getting the answer” (p. 155) so that a student can “latch on it and ignore the rest”

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1 year ago