Jawaban:
15. C. 58°
16. B. 45°
17. D. 75°
18. C.89°
Penjelasan dengan langkah-langkah:
15. (a+7)+(2a+8)=90
a+7+2a+8=90
3a+15=90
3a=90-15
3a=75
a=75:3
a=25
CBD=2a+8=2(25)+8=50+8=58
16. (x+2)+(3x+6)=180
x+2+3x+6=180
4x+8=180
4x=180-8
4x=172
x=172:4
x=43
ABD=x+2=43+2=45
17. x=40+35=75
18. (3x+10)+(2x+35)=180
3x+10+2x+35=180
5x+45=180
5x=180-45
5x=135
x=135:5
x=27
< 2 = 2x+35=2(27)+35=54+35=89
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Jawaban:
15. C. 58°
16. B. 45°
17. D. 75°
18. C.89°
Penjelasan dengan langkah-langkah:
15. (a+7)+(2a+8)=90
a+7+2a+8=90
3a+15=90
3a=90-15
3a=75
a=75:3
a=25
CBD=2a+8=2(25)+8=50+8=58
16. (x+2)+(3x+6)=180
x+2+3x+6=180
4x+8=180
4x=180-8
4x=172
x=172:4
x=43
ABD=x+2=43+2=45
17. x=40+35=75
18. (3x+10)+(2x+35)=180
3x+10+2x+35=180
5x+45=180
5x=180-45
5x=135
x=135:5
x=27
< 2 = 2x+35=2(27)+35=54+35=89