Respuesta :
Answer:
5cm = r
Step-by-step explanation:
The area of a circle is given by
A = pi r^2
78.5 = 3.14 r^2
Divide each side by 3.14
78.5/ 3.14 = r^2
25 = r^2
Take the square root of each side
sqrt(25) = sqrt(r^2)
5 = r
Answer:
The Radius= 5
Step-by-step explanation:
First since you divide the area by 3.14, which should get you 25. Then your supposed to find the square root of 25 OR in other terms find 2 numbers when multiplied equal 25. That is 5.
To check your answer:
To check if this is correct simply find the area by using the radius.
The formula is radius multiplied by itself then multiplied by pi/3.14.
5x5=25, 25x3.14=78.5
There you go! 78.5 is the area!