Radio station KMA is increasing its radio listening radius from 40 miles to 50 miles. How many additional square miles of listening area, to the nearest tenth, will the radio station gain?
Area of a circle= Pi times radius squared
The answer I got was 2827.4
I just want to know if it was right
2007-05-31 13:01:03 · 6 answers · asked by av8ar7 1 in Science & Mathematics ➔ Mathematics
I got 2826, but I was using 3.14 for Pi
So, if you used the Pi key, then you are right.
2007-05-31 13:05:13 · answer #1 · answered by Brian M 3 · 0⤊ 0⤋
A = pi(50^2-40^2) = 900*pi = 2827.4
You are correctomondo.
2007-05-31 20:15:08 · answer #2 · answered by ironduke8159 7 · 0⤊ 0⤋
Actually, it an area question.
The area with radius of 40 = pi*40^2 = 5026.55
The area with radius of 50 = pi*50^2 = 7853.98
The difference is what you want so:
7853.98 - 5026.55 = 2827.43 ~ 2827.4
You have it right.
2007-05-31 20:08:51 · answer #3 · answered by RG 3 · 0⤊ 0⤋
The answer is
Pi(50^2-40^2)
-3.14(50+40)(50-40)
3.14*90*10
=2826 sq miles
if pi is taken as 22/7,the answer would be 2828.57 sq. miles
2007-05-31 20:08:48 · answer #4 · answered by alpha 7 · 0⤊ 0⤋
Yup sounds right although don't forget your units!
2827.4 miles
2007-05-31 20:07:33 · answer #5 · answered by Dara D 1 · 0⤊ 0⤋
Yes. That is what I get.
2007-05-31 20:06:30 · answer #6 · answered by Barkley Hound 7 · 0⤊ 0⤋