Question

The diameter of a coin is 4.2 cm. Find its surface area

Answer 1

Radius = diameter / 2

4.2 / 2 = 2.1

and area = pie radius ^ 2

area = 22/7. 2.1 x 2.1 = 4.41

22/7 x 4.41 = 13.26

hope it's helpful for you ✌️✌️✌️✌️

Answer 2

diameter= 4.2 cm

radius= 4.2/2= 2.1

surface area=

2* πr^2 (excluding the thickness since its not given)

2* 22/7* 2.1*2.1

= 44*0.3*2.1

= 27.72 cm^2