A stone is dropped into a quiet lake and waves move in circles at a speed of 4cm per second. At the instant, when the radius of the circular wave is 10 cm, how fast is the enclosed area increasing?

A stone is dropped into a quiet lake and waves move in circles at a speed of 4cm per second. At the instant,when the radius of the circular wave is 10cm, how fast is the enclosed area increasing?

A stone is dropped into a quiet lake and waves move in circle at a speed of 4 cm per second, At the instant, when the radius of the circular wave is 10 cm, how fast is the enclosed area increasing?

A stone is dropped into a quiet lake and waves move in circles at a speed of 3.5 cm per second. At the instant when the radius of the circular wave is 7.5 cm, how fast is the enclosed area increasing ? (Take pi = 22//7 )

A stone is dropped into a quiet lake and waves in circles at a speed of 4 cm per second. At the instant, when the radius of the circular wave is 10 cm, how fast is the enclosed area increasing?

A stone is dropped into a quiet lake and wave move in circles at a speed of 5cm per second. At the instant when the radius of the circular wave is 8 cm, how fast is the enclosed area increasing?

A stone is dropped into a quiet lake and waves move in circles at a speed of 3.5 cm per second. At the instant when te radius of the circular wave is 7.5 cm, how fast is the enclosed area increasing?

A stone is dropped into a quiet lake and waves moves in circles at a speed of 4 cm/sec. At the instant when the radius of the circular wave is 10 cm, how fast is the enclosed area increasing?

A stone is dropped into a quiet lake and waves move in circles at a speed of 4cm/sec. At the instant when the radius of the circula wave is 10cm, how fast is the enclosed area increaseing?

A stone is dropped into a quiet lake and waves move in a circle at a speed of 3.5 cm/sec. At the instant when the radius of the circular wave is 7.5 cm, how fast is the enclosed area increasing