In: Math
A circular puddle is expanding. How quickly is the radius
changing when the area is 50 square centimeters and the area is
increasing by 4 square centimeters per second?
we know that area of circular puddle is given by,
differentiate both the side with respect to t we can say that,
---------------------------------------------------------1)
As given we have to find the rate of change of radius when area is 50 square cm and area is increasing by 4 square cm per second
it means we have A = 50, dA/dt = 4
we have,
Hence we can write,
radius can't be negative hence we can write,
we have,
Put them in equation 1) we can write,
rounding to two decimal places we can say that,
Hence we can say that radius is changing at a rate of 0.16 cm per second