1.
Given angle: 105°
a = 180 - 105
a = 75°
Apply corresponding angles rule
b = 75°
c = 105°
2.
Let x = ∠ADB
∠BDC = 3 (∠ADB)
x + 3x = 180
4x = 180
x = 45°
Therefore:
∠ADB = 45°
∠BDC = 45 * 3
∠BDC = 135°
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Answers & Comments
1.
Given angle: 105°
a = 180 - 105
a = 75°
Apply corresponding angles rule
b = 75°
c = 105°
2.
Let x = ∠ADB
∠BDC = 3 (∠ADB)
x + 3x = 180
4x = 180
x = 45°
Therefore:
∠ADB = 45°
∠BDC = 45 * 3
∠BDC = 135°