Question

calculate the area of the circular pathway formed by two concentric circles having radius R=18.5 cm and r=3.5cm

Answer 1

Area of circular Pathway= π(R^2-r^2)
=22/7(18.5^2-3.5^2)
=22/7(18.5+3.5)(18.5-3.5)
=22/7×22×15
=3.14×330
=1036.2cm^2.