suatu lingkaran kelilingnya 44 cm,luas lingkaran itu?

Keliling Lingkaran = 2 × π × r
44 = 2 × 22/7 × r
44 = 44/7 × r
44 (7) = 44 × r
308 = 44 × r
r = 7 cm

Luas Lingkaran = π × r²
•••••••• = 22/7 × 7²
•••••••• = 22/7 × 49
•••••••• = 22 × 7
•••••••• = 154 cm²

44 = π .d
44= 22/7.d
44 : 22/7 = d
44 x 7/22 = d
14 = d
r = 14 :2 = 7

L lingkaran = π.r²
= 22/7.7.7
= 154 cm²