Perhatikan gambar di atas !
Berdasarkan gambar di samping nilai a adalah....
A. 30
B. 60
C. 90
D. 120
Berdasarkan gambar di samping nilai a adalah....
A. 30
B. 60
C. 90
D. 120
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Jawab:
B. 60
Penjelasan:
2a pelurus a
oleh karenanya
2a + a = 180
3a = 180
a = 180/3
a = 60
(xcvi)