Question

plzz ans plzzzzz plzzzz​

Answer 1

Use basic trignometry to solve it

Answer 2

AB IS A CHORD OF A CIRCLE.

in triangle ABO ,

OA=OB(they are redius of circle) and angle AOB=60degree

then triangle ABO is an equeterial triangle

so,AB=OA=OB=5cm

hope it will help you plz mark it as brainlist