The area of a circle is increasing at the rate of pi cm^(2)/min. at what rate is the radius increasing when the area is 4pi cm^(2)?

yes. we do proportions in probabilities.

step-by-step explanation:

assume that you have 3 different side lengths.   apply the pythagorean theorem here:   square each of the two shortest sides; call them a and b, so that their squares are a² and b².   also square the longest side, calling the result c².

now, if a² + b² = c² is true, the triangle is a right triangle; otherwise it is not a right triangle.