The area is pi*radius2 = 452 cm2, approx.
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The area is ~452.3 cm2
Area = pi*122 = 452.389 square cm to 3 dp
Using 3.14 as Pi the area of circle is: 113.03999999999999
Do you know how to find the area of a circle when you know the radius ? Good! Do that. Do you know how to find the area of a square when you know the length of the side ? Good! Do that. Now you have two numbers ... the area of the circle and the area of the square. The problem wants you to find the difference of these two numbers. Do you know how to use subtraction to find the difference of two numbers ? Good! Do that.
The area of a circle with a radius of 14.4 is 651.4