Question

if angle oab = 60 and ob = 4cm,then find the radius of the circle.​

Answer 1

Answer:

radius = 4$\sqrt{3}$cm

Step-by-step explanation:

OA=4 cm (the data you have provided seem to be wrong, if ob is 4cm then that is the radius itself)

AB is a tangent to the circle

The radius and tangent will be perpendicular to each other at the point of contact therefore angle OBA = 90 degree forming a right triangle

we can use trigonometry concept on angle A.

if we use tan A = tan 60 = $\sqrt{3}$ = opp/adj = OB/AB

OB = AB x$\sqrt{3}$

OB = 4$\sqrt{3}$ cm

Answer 2

Answer:

How was your Pre Board 2 ?

Step-by-step explanation:

Same School and Same Question...