Hitunglah luas dan keliling lingkaran jika jari jari 19 cm

diketahui
r = 19
d = 19 × 2 = 38

luas lingkaran
= πr²
= 3,14 × 19 × 19
= 1.133,54 cm²

keliling lingkaran
= πd
= 3,14 × 38
= 119,32 cm

semoga membantu

r = 19 cm

L = phi × r^2
L = 3,14 × 19 × 19
L = 1133,54 cm^2

K = 2 × phi × r
K = 2 × 3,14 × 19
K = 119,32 cm