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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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6 0
3 years ago
#7. What are the values/ how do I do it
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Answer:

x =2

SK = 21

KY = 13

SY = 34

Step-by-step explanation:

we can see from the picture the following:

SK + KY = SY  equation 1

SK=13x-5    equation 2

KY = 2x+9    equation 3

SY = 36-x     equation 4

using equation 2, equation 3 and equation 4 in equation 1 we have:

13x - 5 +  2x + 9 = 36-x  

15x +4 = 36 - x

15x +x = 36-4

16x = 32

x = 32/16

x= 2

using x as 2 we evaluate it in equation 2, equation 3 and equation 4:

SK=13(2)-5 = 21

KY= 2(2) +9 = 13

SY = 36-2 = 34

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4th dot

Step-by-step explanation:

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