tolong di bantu kak.. Bsk di kumpul

2)
A
= Keliling lingkaran × 60 : 360
= phi × d × 60 : 360
= 22/7 × 28 × 60 : 360
= 14,6
B
= Luas lingkaran × 60 : 360
= phi × r² × 60 : 360
= 22/7 × 14² × 60 : 360
= 102,6
3)
A
Luas lingkaran
= 90 × 360 : 60
= 540
Luas juring AoB
= 540 × 45 : 360
= 67,5
B
Keliling lingkaran
= 9 × 360 : 45
= 72 cm
Panjang busur bc
= 72 × 60 : 360
= 12 cm
4)
Panjang busur
= phi × d : 4
= 22/7 × 21 : 4
= 16,5 cm
Keliling bangun
= 10,5 + 10,5 + 16,5
= 37,5 cm