the area of a circle is increased by 300 % . by what percent has the diameter of the circle increased ?
the area of the circle is increased by 300 % , thus the area is increased 4 times . the area of a circle it proportional to the square of the diameter ( area = π d ^ 2 / 4 ) , therefore the diameter must increase 2 times ( diameter increase 2 times = area increase 4 times ) , which is increase by 100 % . answer : d .
multiply(const_100, divide(const_2, const_2))