No 85,86,88,89,90tolong dikerjakan dengan caranya!!!
Jawaban:
85. Jawab :
Nilai x :
2x + 3x = 180
5x = 180
x = 180 / 5
x = 36°
Sudut A = x + 12°
= 36 + 12
= 48° ( B.)
86. Jawab :
Sudut DBC = Sudut DBC
= 360° – ( 110 × 2 )
= 360° – 220°
= 140° ( C. )
88. Jawab :
Segi tiga sama kaki sisinya sama
maka :
Nilai y:
y = 36°
Nilai x :
180° = 36 ( 3 )
180° = 108°
x = 180 – 108
x = 72°
Nilai x – y
72° – 36° = 36° ( D.)
89. Jawab :
Nilai y :
7y – 6 = 150
7y = 150 + 6
7y = 156
y = 156 /7
y = 22,28 ( dibulatkan)
y = 20° ( B.)
90. Jawab :
Nilai x :
x + 90 = 2x
x = 90 /2
x = 45° ( B.)