Laura is mailing 10 letters and 10 postcards. letters cost 39 cents each and postcards cost 24 cents each. which expression below could be used to find the total cost for this mailing? a. (10)(0.24)(0.39) b. (10)(0.24)+0.39 c. (10)(0.24+0.39) d. 20(0.39+0.24)

< 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⭐

false

step-by-step explanation:

rulers and compasses arent required in order to bisect an angle because when bisecting angles, you're making a "half circle" and considering in order to bisect an angle it wouldn't be straight, you wouldn't need either of the two