Sawa
Kama vipi shusha nondo hapa tupate jibu.
(sin(78°)/sin(18°)) x (sin(24°)/sin(18°)) x (sin(DBA)/sin(DBC)) = 1
sin(78°) approx 0.9781,
sin(18°) approx 0.3090
sin(24°) approx 0.4067
0.9781/0.3090 approx 3.165
0.4067/0.3090 approx 1.316
3.165 × 1.316 approx 4.166
4.166 × sin(DBA)/sin(DBC) = 1
sin(DBA)/sin(DBC) approx 0.24
Let angle DBA = y, then angle DBC = 42° - y
sin(y)/sin(42°- y) approx 0.24
Solving numerically, let's try y = 8°
sin( 8°) approx 0.1392, sin(34°) approx 0.5582
0.1392/0.5582 approx 0.249 (close to 0.24)
So, angle DBA approx 8 and angle DBC approx 34
Angle ADB = 180° - 78° - 8° = 94°
Angle ADC + angle ADB + angle BDC = 360°
Angle BDC = 360° - 144° - 94° = 122°
x = 122°