How to find the area of a circle

To find the area of a circle use the formula:  A = π * r^2

r is the radius that is given.

Example:  Find the area of a 5 in radius circle

A = π * (5)^2

A = 25π

A = 78.54

Hope this helps :)

< 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⭐