Please can someone help me with these Qs:
10) A chord AB subtends an angle of (theta) radians at the centre O of a circle of radius 6.5cm. Find the area of the segment enclosed by the chord AB and the minor arc AB, when:
a) theta=0.8
b) theta=2/3 Pi
c) theta= 4/3 Pi
11) An arc AB subtends an angle of 0.25 radians at the circumference of a circle, centre O and radius 6 cm. Calculate the area of the minor sector OAB.
13) A sector of circle of radius 28 cm has perimeter P cm and area A cm^2. Given that A=4P, find the value of P.