Question

Tolong kerjakan no 10,11,12,13

Answer 1

10. x + 20 + 2x + 10 = 180
3x + 30 = 180
2x = 180 - 30
2x = 150
x = 150 ÷ 2
x = 75°

CBD = 2x + 10
= 2.75 + 10
= 150 + 10
= 160°

11. 105 + x = 180
x = 180 - 105
x = 75°

90 + y + 32 = 180
122 + y = 180
y = 180 - 122
y = 58°

x + y = 75 + 58
= 133°

12. 2x - 5 + 5x + 10 = 180
7x + 5 = 180
7x = 180 - 5
7x = 175
x = 175 ÷ 7
x = 25°

13. pertama, beri garis bantu yg sejajar dengan garis mendatar yg atas dan bawah dg melewati titik sudut x

180 - 145 = 35°

maka x = 30 + 35
= 65°