kalau bisa jawab tolong bantu pakai cara ya..

22. alas trapesium = 6 + 6 + 16 =28
[tex] \sqrt{100 - 64} \\ = \sqrt{36} \\ = 6 [/tex]
luas trapesium = 1/2 (a + b) × t
= 1/2 (16 + 28) × 10
= 220
luas lingkaran =
[tex]\pi {r}^{2} \\ = 3.14 \times {5}^{2} \\ = 78.5[/tex]
luas daerah yang diarsir adalah
luas trapesium - luas lingkaran
= 220 - 78.5
= 141.5

21. p = l + 3
keliling persegi = 2p + 2l
30 = 2p + 2l
30 = 2 (l + 3) + 2l
30 = 2l + 6 + 2l
24 = 4l
l = 6
30 = 2p + 2l
30 = 2p + 12
18 = 2p
p = 9

luas persegi = p × l
= 9 × 6
= 54 meter persegi

32. Un = a + (n - 1)b
Un = 5 + (n - 1)2
Un = 5 + 2n - 2
Un = 2n + 3

34. Un = a + (n - 1)b
U7 = a + (7 - 1)b
U7 = a + 6b
42 = a + 6b
a = 42 - 6b
Un = a + (n - 1)b
U11 = a + (11 - 1)b
U11 = a + 10b
66 = a + 10b
66 = (42 - 6b) + 10b
66 - 42 = 10b - 6b
24 = 4b
b = 6
a = 42 - 6b
a = 42 - 36
a = 6
Sn = n/2 (2a + (n - 1)b)
S18 = 18/2 (2×6 + (18 - 1)6)
S18 = 9 (12+102)
S18 = 1026