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sdt segitiga - sudut CBD ( 180 - 120 = 60)
no . 5
A1=A3=B1=B3( Sejajar ), A2=A4=B2=B4( Sejajar)
A2 + B3 = 180
( 3x + 45 )+( 5x + 23 ) = 180
8x + 68 = 180
x = 180 - 68 : 8
x = 14
karna ditanyakan B1 kan sama dgn sdt B3 maka
(5x + 23) = 5 × 14 + 23
= 93
<P2=<P3
180’=<P1+<P2+<P3
180’=128’+<P2+<P3
180’-128’=<P2+<P3
52’=<P2+<P3
<P2=<P3=52’:2
<P2=<P3=26’
<R2=<R3
<R1=<P2+<P3
<R1=52’ 180’=<R1+<R2+<R3
180’=52’+<R2+<R3
180’-52’=<R2+<R3
128’=<R2+<R3
<R2=<R3=128’:2
<R2=<R3=64’
<Q=180’-(<P2+<R2)
<Q=180’-(26’+64’)
<Q=180’-90’
<Q=90’
4.
<CBA=<BCA
<CBA=180’-<CBD
<CBA=180’-120’
<CBA=<BCA=60’
<BAC=180’-( <CBA+<BCA)
<BAC=180’-(60’+60’)
<BAC=180’-120’
<BAC=60’
5.
180’=<A2+<B3
180’=(3x+45)’+(5x+23)’
180’=(3x+5x+45+23)’
180’=(8x+68)’
180’-68’=8x
112’=8x
x=112:8
x=14
<B1=<B3
<B1=(5x+23)’
<B1=(5(14)+23)’
<B1=(70+23)’
<B1=93’
Semoga kamu bisa ngerti. Lain kali tolong kerjain sendiri ya :) kan susah nanti kamunya kalo ulangan nanti kalo gini aja gabisa