In the given figure, AB is a diameter of the circle with centre O. DO

1.	In the given figure, AB is a diameter of the circle with centre O. DO is parallel to CB and ∠ DCB = 120o. Calculate : (i) ∠ DAB, (ii) ∠ DBA, (iii) ∠ DBC, (iii) ∠ ADC. Also, show that the Δ AOD is an equilateral triangle.
Answer» In the given figure, AB is a diameter of the circle with centre O. DO is parallel to CB and $∠$ DCB = $120^{o}$ . Calculate : (i) $∠$ DAB, (ii) $∠$ DBA, (iii) $∠$ DBC, (iii) $∠$ ADC. Also, show that the $Δ$ AOD is an equilateral triangle.

In the given figure, AB is a diameter of the circle with centre O. DO is parallel to CB and ∠ DCB = 120o. Calculate : (i) ∠ DAB, (ii) ∠ DBA, (iii) ∠ DBC, (iii) ∠ ADC. Also, show that the Δ AOD is an equilateral triangle.

Answer»

In the given figure, AB is a diameter of the circle with centre O. DO is parallel to CB and $∠$ DCB = $120^{o}$ . Calculate :

(i) $∠$ DAB, (ii) $∠$ DBA,

(iii) $∠$ DBC, (iii) $∠$ ADC.

Also, show that the $Δ$ AOD is an equilateral triangle.