luas lingkaran = 154 cm, hitunglah jari jari lingkaran

L.lingkaran =
πr^2 = 154
3,14 r^2 = 154
r^2 = 154/3,14
r^2 = 49
r = √49
r = 7 cm

L = [tex] \pi r^{2} [/tex]
154 = [tex] \frac{22}{7} r^{2} [/tex]
[tex] \frac{154 . 7}{22} = r^{2} [/tex]
[tex]49 = r^{2} [/tex]
[tex] \sqrt{49} = r[/tex]
7 = r