1.

17. In the figure, if AB divides ZDAC in the ratio 1 3, determine the value of x.108"

Answer»

∠DAC = 72°

∠BAC = 3/4(72°) = 54°

∠DAB = ∠ADB = 18°

⇒ x° + ∠BAC = ∠DBA

= 180° - 36° = 144°

⇒ x = 90°



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