Astudent needs to make a circular cardboard piece with an area between 154 square inches and 616 square inches. the function f(r) relates the area of the cardboard piece, in square inches, to the radius r in inches. which of the following shows a reasonable domain for f(r)?

7 < r < 14

This is the answer to the question.

< 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⭐