Sunday

January 25, 2015

January 25, 2015

Posted by **sarah** on Friday, June 28, 2013 at 10:58am.

Area (to the nearest square centimeter) = cm2

I plugged in everything C = 2 r

C=2x3.14x100= 628 <<< The computer said it was WRONG !

Then, I tried C= 2X3.14X50= 314 !!!

If I am wrong can you EXPLAIN to me what I am doing wrong.

- Math -
**Steve**, Friday, June 28, 2013 at 11:03amC = 2πr

r = C/2π

area = πr^2 = π(C/2π)^2 = C^2/4π

so, area = 10000/4π = 2500/π = 796 cm^2

**Answer this Question**

**Related Questions**

math - 1. Find the area of a circle whose diameter is 5.1 centimeters (cm). Use ...

Math - Find the difference between the perimeter of a square of area 1 ...

math - a square has an area of 169 square centimeters. find the area of the ...

math - I'm asked to find the circumference of a circle to the nearest tenth and ...

Math - Compute the area of a triangle with a base of 15 cm and an altitude of 10...

Circumference and Area of Circles - can someone help me with these:Find the ...

geometry - 1. What is the lateral surface area of a square pyramid with side ...

geometry - 1. Find the area of the parallelogram. (1 point) 3,302 ft2 3,484 ft2 ...

Math - Two perpendicular diamters(cutting each other at right angles) of a ...

geometry - I need to find the area of the shaded portion of a circle with a ...