What is the radius of a circle whose area is 154 square centimeters?

2*pi*r =154

pi* r    = 154/2

pi * r   = 77

22/7 * r = 77

r           = 77* 7/22

r           =  14/2

r           = 7//

so that. radious of that circle is 7 cm//

154 = pi * r^2      divide both sides by pi

154/pi = r^2        take the positive root of both sides

about 7 cm