luas lingkaran yg kelilingnya 37,68 cm adalah

k = phi x d
37.68 = 3.14 x d
37.68/3.14 = d
12 = d
d = 12

jari jari = 1/2 x d = 1/2 x 12 = 6
luas lingkaran
= phi. r²
= 3.14 x 6 x 6
= 113.04 cm²