A chocolate bar is sold in the shape of a triangular prism. A larger version of the chocolate bar is being considered. The ends of the prism are congruent
isosceles triangles. The equal sides of the isosceles triangle are 4 cm and the
other side is 5 cm. The prism is 15 cm long.

use times X and divide it

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐

the answers c