mohon dibantu dg penyelesaiannya ya,, (lingkaran)

14.
K. ⊙ = 2πr
K. ⊙ = 2π.25
K. ⊙ = 50π

α/360 = LJ/L. ⊙ = PB/K. ⊙
α/360 = PB/K. ⊙
72/360 = PB/50π
1/5 = PB/50π
PB = 50π ÷ 5
PB = 10π (D)

15.
108/90 = x/7,5
90x = 810
x = 810/90
x = 9 cm (B)

16.
63/42 = 15/x
63x = 630
x = 630/63
x = 10 cm​​​​​​​² (B)

17.
L. Arsiran = L.□ - 1/2 L.⊙
20.20 - 1/2 . 3,14 . 10 . 10
400 - 1/2 . 314
400 - 157
= 243 cm² (ga ada jawaban(?))

18.
α/360 = PB/K. ⊙
36/360 = 6,28 /K. ⊙
1/10 =6,28/K. ⊙
62,8 = K. ⊙

πd = K. ⊙
3,14 . d = 62,8
d = 628/10 ÷ 314/100
d = 628/10 . 100/314
d = 6280/314
d = 20 cm
r = d/2
r = 10 cm (C)

semoga membantu!