Se arroja una piedra en un estanque tranquilo, formandose ondas circulares concentricas que se dispersan. Si el radio de la region afectada crece a razon de 16 cm/s, la razon del area de la region afectada cuando su radio es de 4 cm: A stone is thrown into a quiet pool, forming concentric circular ripples that disperse. If the radius of the affected region grows at a rate of 16 cm / s, the ratio of the area of the affected region when its radius is 4 cm