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3a° = 90°
a = 30
46+ a + 29+ 5a + 15= 180 (berpelurus)
80 + 6a = 180
6a = 180-80
6a = 100
a = 100÷6
= 16,66
4) A = 2/3 B
a. A+B=180
2/3 B + B = 180
5/3 B = 180
B = 180 × 3/5
B = 108°
b. A+B=90
2/3 B+B=90
5/3 B = 90
B = 90 × 3/5
B= 54°
5) A-B = 70°
A = 3B
a. A-B = 70
3B-B = 70
2B = 70
B = 35
A= 3B
= 105
A+B = 105 + 35
= 140°
b. A+ pelurus = 180
105 + pelurus = 180
pelurus = 180-105
pelurus = 75°
6a) A1, B1, C1, D1 sehadap
A2, B2, C2, D2 Sehadap
A3, B3, C3, D3 sehadap
A4, B4, C4, D4 sehadap
b dan c srh org lain yg kerjakan
kepala saya sudah pusing maaf y