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alexira [117]
3 years ago
6

How do I work this out?

Mathematics
2 answers:
marin [14]3 years ago
4 0
Area of a full circle is: PI x r^2

so full circle is 4^2 x PI = 16PI

the shaded part is 3/4 of the circle

16 x 3/4 = 12
 so 12 PI ft^2 is shaded

Vikentia [17]3 years ago
3 0
First, find the area of the circle as a whole. Then find the percentage or fraction of that area.

STEP ONE

As you probably know, you use this formula to find the area of any circle.

A=\pir^2

We know what the radius is, so substitute the 4 for the r in the formula.

A=4^2\pi

Simplify.

A=4^2\pi
A=16\pi

STEP TWO

Now that we know what the area of the circle is as a whole, let's find the fraction of that area. We want to the know the area of the shaded part.

Multiply the area by 3/4.

(16\pi)(3/4)
(48\pi)/4
12\pi

So, the answer is the first option.
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A tangent is >insert answer here< to the radius that shares the point of tangency
tatuchka [14]
A tangent line is always perpendicular to the radius that shares the point of tangency.  In other words, where your tangent line touches the circle (at only one point), that line is perpendicular to the radius at that point.

3 0
3 years ago
The upper-left coordinates on a rectangle are (-5, 6)(−5,6)left parenthesis, minus, 5, comma, 6, right parenthesis, and the uppe
sammy [17]

Answer:

Step-by-step explanation:

The question is incomplete. Here is the complete question.

The upper-left coordinates on a rectangle are (−5,6) and the upper-right coordinates are (−2,6). The rectangle has a perimeter of 16units. Draw the rectangle on the coordinate plane below.

If the coordinates of the top of the triangle (breadth) is  (−5,6) and  (−2,6), we can calculate the breadth of the rectangle by taking the difference between the two points using the formula:

D = √(y₂-y₁)²+(x₂-x₁)²

Given x₁ = -5, y₁= 6, x₂ = -2 and y₂ = 6

D = √(6-6)²+(-2-(-5))²

D = √0²+3²

D = √9

D = 3 units

Breadth = 3 units

Given the Perimeter to be 16 units and the formula for calculating the perimeter of rectangle t be P = 2(L+B), we can get the length of the rectangle.

16 = 2(3+L)

16 = 6+2L

16-6 = 2L

2L = 10

L = 10/2

L = 5 units.

<em>Hence the length of the rectangle is 5 units and the breadth is 3 units. Find the diagram in the attachment.</em>

7 0
3 years ago
The center of the circle is at (-2,-7) and its radius is 36.
Vanyuwa [196]
Standard form for circle with radius r and center (h,k) is
(x-h)^2+(y-k)^2=r^2

r=36
center at -2,-7
(x-(-2))^2+(y-(-7))^2=36^2
(x+2)^2+(y+7)^2=1296


firts option
6 0
2 years ago
Someone please hurry and help with the two I got wrong !!!!!!!
steposvetlana [31]

Answer:

-2

35

Step-by-step explanation:

yeah-ya.........

right?

8 0
2 years ago
1/3 of $6.00 <br> What is the new price? <br> Show how you got your answer please!
Katarina [22]

Answer:

$2

Step-by-step explanation:

1/3 of $6 = 1/3 * 6 = $2.00

5 0
2 years ago
Read 2 more answers
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