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= 2 x 3,14 x 20
= 125,6 (B)
2. keliling lapangan = keliling 1 linpakaran + 2 P
= π D + (2 x 150)
= (22/7) x 49 + 300
= 4540 m
= 4,540 km (C)
3.
BOC = 55 x 2 = 110
COD = 180 - 110 = 70 (C)
4.
RQT = 180 - 38 - 114 = 28
SPR = RQT = 28 (C)
5.
ABE = ACE = ADE = 147 : 2 = 73,5
ACE + ADE = 73,5 x 2 = 147 (C)
6.
POR = 180 - 60 = 120
panjang busur = ( 60/360) x 2 x (22/7) x 14
= 14,67 (B)
7.
105⁰ 75 ⁰
----- = -----
140 L
105 L = 75 x 140
105 L = 10.500
L = 100 (D)
kliling = 2 x π x r
= 2 x 3,14 x 20
= 125,6 ( jawabn B)
nomer 14
kO = π x d
= 22/7 x 49
= 154
k = 154 + 2(150)
= 154 + 300
= 454 (jawaban C)
nomer 15
BOC = 2 x 55
= 110
COD = 180-110
= 70
nomer 16
SPR = 180 - 38 - 144
= 28
nomer 17
ABE = 147 : 3
= 47
ade + ace = 49 + 49
= 98
nomer 18
POR = 2 x 60
= 120
busur = 120/360 x 2 x π x r
= 1/3 x 2 x 22/7 x 14
= 1/3 x 2 x 22 x 2
= 29,33