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Softa [21]
3 years ago
8

If the area of the circle is 97.9 units squared, what is the radius?

Mathematics
1 answer:
mote1985 [20]3 years ago
6 0

Answer:

r = 5.58

Step-by-step explanation:

The area of a circle is given by

A = pi r^2

97.9 = 3.14 r^2

Divide each side by 3.14

97.9/3.14 =3.14 /31.4 r^2

31.17834395 = r^2

Take the square root of each side

sqrt(31.17834395) = sqrt(r^2)

5.583757153 = r

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Prove that in any pythagorean triple, one of the side lengths is divisible by 5
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if m or n or both are divisible by 5, then 2mn will be divisible by 5
I don't know if you know about x mod(5), but in that case there can only be 4 possibilities for m and n
m mod (5) = +/- 2 or m mod(5) = +/- 1
In the first case m^2 = 4 mod(5) and in the second case m^2 = 1 mod(5) N has the same considerations. 
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2 years ago
One number is 10 more than twice another. Their sum is 1 . Find the numbers.
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<u>Answer: </u>

One number is 10 more than twice another.Their sum is 1.The numbers are -3 and 4

<u>Solution: </u>

Given that one number is 10 more than twice the other.

Let us consider the two numbers as “x” and “y”

First number = x

Second number = y

From question, consider “y” is 10 more than twice the “x”. This can be represented  

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