-2x squared
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You add c squared and b squared together to get a squared. This is based on the Pythagorean theorem, which states that in a right triangle, the square of the hypotenuse (a) is equal to the sum of the squares of the other two sides (b and c).
There are 10,000 square centimeters in a square meter.
8
Your question doesn't make sense. The area of a circle is Pi (approximately 3.14) times the RADIUS squared. An example would be a circle with a diameter of 6 inches and thus the circle would have a radius of 3 inches. Three squared (3 times 3) is 9, and 9 times Pi is approximately 28.3 square inches.
If the period is increased, the centripetal force needed to keep the object moving in a circular path will decrease because the velocity of the object is lower for a longer period. The centripetal force is inversely proportional to the square of the period.