What is cos(Negative 30 degrees)? Sketch a graph to help determine the answer. a. 0.50 c. -1 b. 0.87 d. 0

Step-by-step explanation:

-34.4444

-34.4

Step-by-step explanation:

the answer is d. 75%

< 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

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