tolong yh ka jawab nomor 18 19 sma 20 mksh

18. A1= 180-55=125 derajat
19. besar CFE =180-115=65 derajat
20. besar sudut PQR =(180-30-90) + 40
=60+40
= 100 derajat

No 18.
A1=B1 A2=B2
B1+B2=180
A1+B2=180
A1+55=180
A1=125

No 19.
<BEF=<CFE
115+<BEF=180
115+<CFE=180
<CFE=65

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