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frutty [35]
3 years ago
10

I need help with #20

Mathematics
3 answers:
lora16 [44]3 years ago
8 0

Hey there!

Formula given :

A = πr²

Solve for r

A / π = r²

r = √( A / π )

Hope it helps!

g100num [7]3 years ago
5 0
Hope this helps.
i have solved the equation to help you get a better of how to demonstrate this in the future.

Darina [25.2K]3 years ago
3 0
A=pi r^2
sqrt(A)=pi r
sqrt(A)/pi=r

Answer:sqrt(A)/pi=r

(sqrt(A) means the square root of A)
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max2010maxim [7]
Angle 1: 36 degrees - It is opposite to angle 4, and is therefore equal. To solve for angle 4, you have to do 90 - angle 3 (because it is a right angle and totals 90)
Angle 2: 90 degrees - It is a right angle
Angle 4: 36 degrees (explained above)
Angle 5: 90 degrees - It is a right angle. It is also an opposite angle to angle 2, and is therefore equal to it. 

Since the two diagonal lines are parallel, the angles will relate to each other. 

Angle 7: 126 - It will be 180 - angle 10 (because a straight line = 180)
Angle 8: 54 - It is opposite to angle 10, and is therefore equal
Angle 9: 126 - It will be 180 - angle 8 (because a straight line = 180). It is also an opposite angle 7, and is therefore equal
Angle 10: You already figured this one out! :)
Angle 11: 36 degrees - A triangle is 180, and angles 11, 5, and 8 all make up a triangle. Therefore, 180 - angle 5 - angle 8 = angle 11
Angle 12: 144 degrees - It will be 180 - angle 13 (because a straight line = 180). 
Angle 13: 36 degrees - it is opposite to angle 11, and is therefore equal
Angle 14: 144 degrees - it is opposite to angle 12, and is therefore equal

I hope this helps!
8 0
3 years ago
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