Tolong jawab kak!:'(

3.
r = 14 cm, d = 28 cm
AOB = 30°

A.
Busur AB
= 30°/360° x keliling lingkaran
= 1/12 x πd
= 1/12 x (22/7)(28)
= 7,33 cm

B.
Luas juring AOB
= 30°/360° x luas lingkaran
= 1/12 x πr²
= 1/12 x (22/7)(14²)
= 51,33 cm²

4.
r = 10,5 cm
AOB = siku-siku = 90°

Luas daerah arsir
= Luas juring AOB - luas ΔAOB
= (90°/360° x luas lingkaran) - (½ alas x tinggi)
= (1/4 x (22/7)(10,5²) - (½ 10,5 x 10,5)
= 86,625 - 55,125
= 31,5 cm²