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<BOC + <AOB = 90, kerana saling berpenyku
AOB = 90
<AOB = 90-36
<AOB = 54 (B)
NO 2
<POQ + <QOR = 180, krn saling berpelurus
2a + 50 + 30 = 180
2a + 80 = 180
2a = 180-80
2a = 100
a = 100 : 2
a = 50 (D)
NO 3
<ABE + <EBD + <DBC = 180
4x + 8x + 6x = 180
18x = 180
x = 180 : 18
x = 10
maka, <ABE = 4x = 4(10) = 40 (A)
N0 4
<AOD = <BOC, Krn saling bertolak belakang
<AOD = 180-120
<AOD = 60
<COD = <AOB, krn saling bertolak belakang
<COD = 120
Maka = 60 dan 120 = A
NO 5
maka yg dalam kedua garis sejajar, dan saling berseberangan
maka yg A3 dg B1, dan A4 dg B2 (A atau B, abis sama)
= 54 jawabnnya B
2.) 2a + 50 + 30 = 180
2a +80 = 180
2a = 180-80
2a = 100
a = 100/2
a = 50 jawabannya D
3.) 4x + 8x + 6x = 180
18x = 180
x =180/18
x = 10
ABE = 4 x 10
= 40 jawabnnya A
4.) AOD = 180 - 120
= 60
COD = AOB
= 120 jawabnnya A
5.) dalam berseberangan, besarnya sama. ( a3 = b1 .. a4 = b2)
jawabnnya A