5 625 = 54 So the 4th root of 54 would be 5. You can find this by going to your calculator and typing in 625^(1/4), and you should end up with 5. Another way to think about this is what number times itself 4 times is 625.

circumference = diameter x pi area = radius squared times pi divide circ with pi gives you the diameter diameter/2 gives you radius radius times itself times pi gives you the area get the units right and you're done.

The square root of an answer is a number times itself to get that number so the square root of 4 is 2 the square root of 144 is 12 because 12 times itself gives us the answer of 144