The measure of each of the base angles of an isosceles triangle is 9º less than 4 times the measure of the vertex angle. What is the measure of the base angles? What is the measure of the vertex angle? Please answer as soon as you can, I suck at geometry.

hey can u explain your question A little bit more

Step-by-step explanation:

< 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⭐

(a) the volume of the cone is 20/3 in3

hence, option a is correct.