The surface area of a sphere having a diameter of 8 inches is:

or

Step-by-step explanation:

The surface area of a sphere is calculated by the following formula

Where r is the radius of the sphere

In this case we know that the diameter d of the sphere is

So the radius r is:

So the surface area of the sphere is:

i do not know this sorry : (

< 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⭐