tlng bantu jwb, hitunglah keliling dan luas seluruhnya

120°/180° = 2/3 (1/2 lingkaran)
r = 21 cm

K = 2/6 (2πr)
K = 2/6 (2 x 22/7 x 21)
K = 1/3 (132)
K = 44 cm

L = 2/6 (πr²)
L = 1/3 (22/7 x 21²)
L = 1/3 (1386)
L = 462 cm²

semoga membantu ^^