giving medal for answer , can someone help???:{

Find the area of a circle with a radius of 7.1 m to the nearest square unit.
a.
633 m2
b.
158 m2
c.
50 m2
d.
45 m2

Question

giving medal for answer , can someone help???:{


Find the area of a circle with a radius of 7.1 m to the nearest square unit.
a.
633 m2
b.
158 m2
c.
50 m2
d.
45 m2

goldphenoix · Answer

Do you know the formula of finding the area of a circle?

anonymous · Answer

not really

goldphenoix · Answer

Alright. I'm gonna give you the formula. Make sure to remember it. $$\large \large r^2\pi= A$$

goldphenoix · Answer

Now plug r in the equation. Do you know what 7.1 squared is?

anonymous · Answer

50.41

goldphenoix · Answer

Good. Now what is 50.41 (pi) give you?

anonymous · Answer

whats pi ?? (/.\)

anonymous · Answer

@GoldPhenoix

goldphenoix · Answer

Pi is an irrational number. It is the ratio of a circle's circumference to its diamater. (22/7)
Now pi is appx. to ~3.14. 
So you can multiply 50.41 by 3.14.
Or you can use a calculator and type in 50.41, and the pi button. :)

anonymous · Answer

its b

goldphenoix · Answer

Yes good job! I hope this help. :) If you want to learn more about pi, click here: http://www.mathsisfun.com/numbers/pi.html