What is the measure of `angle DBC`?

In a circle with centre O, BC is a chord. Point D and A are on the circle, on the opposite side of BC, such that angle DBC = 28^@ and BD=DC. What is the measure of angle BOC ? O केंद्र वाले एक वृत्त में, BC एक जीवा है। बिंदु D और A, वृत्त पर स्थित है जो BC के विपरीत है जैसे कि angle DBC = 28^@ और BD = DC। angle BOC का माप कया है

In triangle ABC , angle B=68^@ and angle C=32^@ . Sides AB and AC are produced to points D and E, respectively. The bisectors of angle DBC and angle BCE meet at F. What is the measure of angle BFC ? / triangle ABC में, angle B=68^@ तथा angle C=32^@ है | भुजाओं AB और AC को क्रमशः बिंदु D और E तक बढ़ाया जाता है | angle DBC तथा angle BCE के समद्विभाजक F पर मिलते हैं | कोण BFC का मान ज्ञात करें |

In the figure given below what is the measure of angle BYX ?

In the figure given below, what is the measure of angle CBA ?

In a triangle ABC. AC = 5 cm, AB = 7 cm, BC =sqrt39 what is the measure of angle A ? is the measure of angle A ?