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30) 15 + 24(2) + 18(2)
= 15 + 48 + 36
= 99 cm (D)

31) K = 2p + 2l
= 2(42) + 2(37)
= 84 + 74
= 158 m (B)

32) L1 (stngh lingkaran)
L = 1/2 pi r^2
= 1/2 . 22/7 . (21)^2
= 693

L2 (segitiga)
L = 1/2 . a .t
= 1/2 . 42 . 50
= 1050

L1 + L2
= 693 + 1050
= 1.743 cm^2 (C)