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a : pelurusnya = 2 : 3
jumlah perbandingan = 5
berpelurus maka jumlah ke-2 sudut tsb 180 derajat.
a = 2/5 x 180 = 72°
2. p° dlm sepihak dg q°
maka jmlh kedua sudut tsb adal 180°
p° = 180° - 112° = 68°
2) dalam sepihak, maka
p+q = 180
p+112 = 180
p = 180-112
p = 68⁰