Question

Helllllllpppp, MATH, PLEASE

The area of a circle is 28in squared. The length of the radius is _____in.

3
4.2
6.4
8.9

Answer 1

(A)rea = (pi)(r^2) = 28

r = sqrt(28/pi) = sqrt(28/3.14) = 2.98

which is about 3

Answer 2

thank you soo much, I'm terrible with circles & all the formulas, would you wanna help me with another one.

Answer 3

uw! Sure!

Answer 4

What is the lateral area of a cylinder with a radius of 5 ft and a height of 8 ft?

157ft2
251.2 ft2
96ft2
408.2 ft2

Answer 5

The area of the "sides" is 2(pi)5 times 8 = 80 * pi

= 251.32741228718345907701147066236

The area of the "top" and "bottom" is:

2 x (pi)r^2 = 50(pi)

= 157.07963267948966192313216916398

Answer 6

The lateral area is just the first one, 251.33. It's "without top and bottom". It's just the "label" part if you think of a can of soup.

Answer 7

The "whole area" is 408, the "added up" amount.