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The vertices A, B, C, and D of a quadril...

The vertices A, B, C, and D of a quadrilateral ABCD lie on a circle. `angle A` is thrice `angle C and angle D` is twice `angle B`. What is the difference between the measures of `angle B and angle C`?
किसी परम भुज ABCDके शीर्ष A, B, C,और D एक वृत्त पर स्थित है| `angle A` , `angle C` का तिगुना है और `angle D`, `angle B` का दोगुना है| `angle B और angle C` के माप मेँ कया अंतर है ?

A

`15^circ`

B

`28^circ`

C

`18^circ`

D

`20^circ`

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