1. (12 , -18) y (-15, -18 ) 2. (3, -20) y (5,8)

3. (15 , 8 ) y (-17 , 9 )

4. ( -19 , 12 ) y (-9 , 1 )

( sorry again ) :/

side side side

side angle angle

angle side angle

side angle side

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⭐

asadsadsad

step-by-step explanation:

a mantle plume is an upwelling of abnormally hot rock within the earth's mantle. as the heads of mantle plumes can partly melt when they reach shallow depths, they are thought to be the cause of volcanic centers known as hotspots and probably also to have caused flood basalts.

step-by-step explanation: