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16. 2d + k lingkaran
(2×14) + (22/7×14)
28 + 44
= 72 cm

17. qr² = 8²+6²
qr² = 64+36
qr² = 100
qr = √100 = 10 cm

s= ½(6+8+10)
s= ½(24)
s= 12
L∆ = ½×6×8
L∆ = 24 cm²

Jari-jari Lingkaran dalam
r = L∆/s
r = 24/12
r = 2 cm

L lingkaran= πr²
L lingkaran= π2²
L lingkaran= π4
L lingkaran= 4π

18. bc² = 24²+7²
bc² = 576+49
bc² = 625
bc = √625 = 25 cm

L = ½×24×7
L = 84 cm²

Jari-jari Lingkaran Luar
R = abc/4L
R = 7×24×25/4×84
R = 4.200/336
R = 12,5 cm

16. B
17. B
18. C

semoga membantu

Lingkaran
16. d = 14
Panjang lilitan = 2d + πd = 2(14) + 22/7 x 14 = 28+ 44
Panjang lilitan = 72 cm

17. PQ = 8, PR = 6
QR = √(PQ² + PR²) = √8²+6²
QR = 10
Luas = 1/2 (8)(6)= 1/2 (48) = 24 cm²
S = 1/2 keliling = 1/2 (8+6+10) = 1/2 (24) = 12
Jari jari lingkran dalam  r = L/s
r = 24/12 = 2
Luas lingkaran = π r² =π(2)² = 4π

18. AB =7. AC = 24
BC = √(AB²+AC²) = √(7² +24²)= √625
BC = 25
Luas = L = 1/2 (AB)(AC) = 1/2 (7)(24)= 84

Jari jari lingkaran luar = r = abc/4L
r = (7x24x25)/(4x 84)
r = 4.200/336 = 12,5