The area of a circle is increasing at a constant rate of 79 square centimeters per second. At the instant when the radius of the circle is 77 centimeters, what is the rate of change of the radius

0.51cm/s

Step-by-step explanation:

Area of a circle A = πr²

r is the radius

Rate of change of area is expressed as;

dA/dt = dA/dr • dr/dt

dA/dr = 2πr

radius r = 77cm

dA/dt = 79cm²

Get dr/dt

Substitute the given values into the formula

79 = 2π(77)•dr/dt

79 = 154dr/dt

dr/dt = 79/154

dr/dt = 0.51cm/s

Hence the rate of change of the radius is 0.51cm/s

the answer is b

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.