Mohon Jawab secepatnya kak
diameter = d = 50 cm
keliling lingkaran = k :
k = π × d
k = 3,14 × 50 cm
k = 31,4 × 5 cm
k = 157 cm
luas lingkaran = L :
L = 1/4 × π × d²
L = 1/4 × 3,14 × 50 cm × 50 cm
L = 1/4 × 3,14 × 2.500 cm²
L = 1/4 × 314 × 25 cm²
L = 1/4 × 7.850 cm²
L = 7.850/4 cm²
L = 1.962,5 cm²
Jadi :
keliling lingkaran = 157 cm
luas lingkaran = 1.962,5 cm²
