A man at the top of a watchtower 86 feet above. Level plateau supporting the tower, a rock 450 feet from the base of the tower. What's the measure of the angle of depression of the rock from the top of the tow

< 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⭐

pi x^2

step-by-step explanation:

pi times x squared

the answer is 13

step-by-step explanation:

5*5=25

12*12=144

25+144=169

169^2=13