What is the area of a circle whose radius is 4 cm?

Well, using the formula for the area of a circle, it would be 50.24 cm.
To find the area of a circle, we would multiply pi (), times the radius squared. When a number is squared, that means we must multiply it by itself twice. (BTW, the radius is HALF of the diameter ;)), So to solve the radius squared, we would do 4 x 4, which equals 16, so now we would take 16 and multiply it by pi. Pi is a mathematical solution that goes on for INFINITY, so it has been represented by the first three numbers of the solution; 3.14. Now you would ONLY solve for pi in a problem using 3.14 IF the problem states, "the APPROXIMATE answer". If it asks for the EXACT answer using pi, you would put the solution that has been determined so far NEXT to the pi symbol. So now that's outta the way, we could focus back onto the problem. Now we would multiply 16 times the APPROXIMATE pi (3.14) and it equals 50.24.
Your Final Answer; The APPROXIMATE area of the circle is 50.24 cm.
c: