Tentukan nilai daria. x + y + zb. CBFc. BFD​

mencari x~~

<CDF+<EDF=<CDE(180°)

3x+7x+80=180

10x=100

x=10

mencari y~~

<CDF+<CFD+<DCF=180°

3x+25+<DCF=180

30+25+<DCF=180

<DCF=125

<BCF+<DCF=<BCD(180°)

6y+7+125=180

6y=48

y=8

mencari z~~

<ABF+<CBF=<ABC(180°)

13x+5+<CBF=180

130+5<CBF=180

<CBF=45

<CBF+<BCF+<CFB=180°

45+6y+7+8z=180

45+48+7+8z=180

100+8z=180

8z=80

z=10

.

a)x+y+z=10+8+10=28

b)<ABF+<CBF=<ABC(180°)

13x+5+<CBF=180

130+5<CBF=180

<CBF=45

c)<BFC+<CFD=<BFD

8z+25=<BFD

80+25=<BFD

105=<BFD