9x+3x=90°
12x= 90
x=7.5 atau 75°
22. dik. :
g // l
3y = 4x
2y + 4x = 180°
dit. :
x + y
penye. :
2y + 4x = 2y + 3y 4x = 3y
180° = 2y + 3y 4x = 3(36°)
180° = 5y 4x = 108°
y = 180° ÷ 5 x = 108° ÷ 4
y = 36° x = 27°
x + y = 27° + 36°
= 63°
23. maaf, saya tidak bisa menjelaskan dengan tulisan( butuh gambar)
tapi saya sudah kerja. Jawabannya adalah 126°
24. ∠ABC = 180° ∠ABD = 5x
∠ABD + ∠CBD = 180° ∠ABD = 5(13)
(5x)° + (8x + 11)° = 180° ∠ABD = 65°
(13x + 11)° = 180°
13x = 180° - 11° ∠ADB = 180° - (65° + 55°)
13x = 169° = 180° - 120°
x = 169° ÷ 13 = 60°
x = 13°
25. 9x + 3x = 90° ∠DAC = 9x
12x = 90° 9x = 9(7,5°)
x = 90° ÷ 12 = 67,5°
x = 7,5°
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9x+3x=90°
12x= 90
x=7.5 atau 75°
22. dik. :
g // l
3y = 4x
2y + 4x = 180°
dit. :
x + y
penye. :
2y + 4x = 2y + 3y 4x = 3y
180° = 2y + 3y 4x = 3(36°)
180° = 5y 4x = 108°
y = 180° ÷ 5 x = 108° ÷ 4
y = 36° x = 27°
x + y = 27° + 36°
= 63°
23. maaf, saya tidak bisa menjelaskan dengan tulisan( butuh gambar)
tapi saya sudah kerja. Jawabannya adalah 126°
24. ∠ABC = 180° ∠ABD = 5x
∠ABD + ∠CBD = 180° ∠ABD = 5(13)
(5x)° + (8x + 11)° = 180° ∠ABD = 65°
(13x + 11)° = 180°
13x = 180° - 11° ∠ADB = 180° - (65° + 55°)
13x = 169° = 180° - 120°
x = 169° ÷ 13 = 60°
x = 13°
25. 9x + 3x = 90° ∠DAC = 9x
12x = 90° 9x = 9(7,5°)
x = 90° ÷ 12 = 67,5°
x = 7,5°