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

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 चतुर्भुज ABCD के शीर्ष बिंदु A, B, C और D एक वृत्त पर स्थित हैं | कोण A कोण C से तिगुना है तथा कोण D कोण B से दोगुना है | कोण B और कोण C के मान में क्या अंतर है ?

A

`15^@`

B

`28^@`

C

`18^@`

D

`20^@`

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