Tolong bantu tapi pakek cara ya

panjang busur = x/360 derajat × keliling lingkaran

1. 90/360 × 22/7 × 14
= 1/4 × 44
= 11 cm
2. 60/360 × 22/7 × 42
= 1/6 × 132
= 22 cm
3. 88 = 120/360 × 22/7 × d
88 = 1/3 × 22/7
88 = 22/21 × d
d = 88 ÷ 22/21
= 88 × 21/22
= 4 × 21
d = 84 cm
r = 84 : 2 = 42 cm
4. 31,4 = sp/360 × 3,14 × 200
31,4 = x/360 × 628
31,4 = 628/360 sp
sp = 314/10 ÷ 628/360
= 314/10 × 360/628
sp = 18 derajat
5. 1256 = 72/360 × 3,14 × d
1256 = 1/5 × 3,14 × d
1256 = 0,628 × d
d = 1256 ÷ 628/1000
d = 1256 × 1000/628
d = 2000 cm
r = 2000 ÷ 2 = 1000 cm