FIND THE RADIUS AND DIAMETER OF EACH CIRCLE

Radius of a Circle :

The radius of a circle is the distance from the center of the circle to any point on its circumference. It is denoted by ‘R’ or ‘r’. 

Radius (r) = (Diameter)/2

Diameter of a Circle :

The diameter of a circle is the length of the line starting from one point on a circle to another point and passing through the center of the circle. It is denoted by ‘d’ or ‘D’.

Diameter (d) = 2 × radius

Problem 1 :

Solution :

By observing the figure,

Radius (r) = 3 yd

To find the diameter of a circle, (d) = 2 × r

= 2 × 3

Diameter (d) = 6 yd

Problem 2 :

Solution :

By observing the figure,

Diameter (d) = 92 in

To find the radius of a circle, (r) = D/2 

= (92)/2

Radius (r) = 46 in

Problem 3 :

Solution :

By observing the figure,

Radius (r) = 23 ft

To find the diameter of a circle, (d) = 2 × r

= 2 × 23

Diameter (d) = 46 ft

Problem 4 :

Solution :

By observing the figure,

Diameter (d) = 36 in

To find the radius of a circle, (r) = D/2 

= 36 in/2

Radius (r) = 18 in

Problem 5 :

Solution :

By observing the figure,

Radius (r) = 19 ft

To find the diameter of a circle, (d) = 2 × r

= 2 × 19 ft

Diameter (d) = 38 ft

Problem 6 :

Solution :

By observing the figure,

Diameter (d) = 12 yd

To find the radius of a circle, (r) = D/2 

= 12 yd/2

Radius (r) = 6 yd

Problem 7 :

Solution :

By observing the figure,

Radius (r) = 60 ft

To find the diameter of a circle, (d) = 2 × r

= 2 × 60 ft

Diameter (d) = 120 ft

Problem 8 :

Solution :

By observing the figure,

Diameter (d) = 108 yd

To find the radius of a circle, (r) = D/2 

= 108 yd/2

Radius (r) = 54 yd

Problem 9 :

Solution :

By observing the figure,

Diameter (d) = 6 ft

To find the radius of a circle, (r) = D/2 

= 6 ft/2

Radius (r) = 3 ft

Problem 10 :

Solution :

By observing the figure,

Diameter (d) = 60 yd

To find the radius of a circle, (r) = D/2 

= 60 yd/2

Radius (r) = 30 yd

Problem 11 :

Solution :

By observing the figure,

Radius (r) = 35 ft

To find the diameter of a circle, (d) = 2 × r

= 2 × 35 ft

Diameter (d) = 70 ft

Problem 12 :

Solution :

By observing the figure,

Diameter (d) = 10 in

To find the radius of a circle, (r) = D/2 

= 10 in/2

Radius (r) = 5 in