gunakan penjelasan juga TvT (bantu)
Jawaban:
1) a dan b berpelurus
a = 1/2b
sudut b
a + b = 180°
1/2b + b = 180°
3/2b = 180°
3b = 360°
b = 120°
sudut a
a = 1/2b
a = 1/2 . 120°
a = 60°
2) a dan b berpenyiku
a = 1/2b
sudut b
a + b = 90°
1/2b + b = 90°
3/2b = 90°
3b = 180°
b = 60°
nomor 1
a + b = 180
½b + b = 180
1/2b + 1 = 180
1/2b + 1/1 = 180
1/2b + 2/2 = 180
3/2b = 180
3b = 360
b = 360/3
b = 120
a = ½b
a = ½(120)
a = 1 x 60
a = 60° (c)
nomor 2
a + b = 90
½b + b = 90
3/2b = 90
3b = 180
b = 180/3
b = 60°(c)
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