Given:
Number of jars = 2
Radius of the jar  = 5 cm
She wants to glue a piece of ribbon around the edge of each lid.
To find:
Total length of ribbon she will need for the two jar lids.
Solution:
To find length of ribbon required for a jar, we need to find the circumference of the circle with radius 5.
The circumference of a circle is
[tex]C=2\pi r[/tex]
Where, r is the radius of the circle.
Putting π=3.14 and r=5, we get
[tex]C=2\pi r[/tex]
[tex]C=2(3.14)(5)[/tex]
[tex]C=31.4[/tex]
The ribbon required for one jar is 31.4 cm. So, the ribbon required for two jars is:
[tex]\text{Ribbon required}=2\times C[/tex]
[tex]\text{Ribbon required}=2\times 31.4[/tex]
[tex]\text{Ribbon required}=62.8[/tex]
The ribbon required for two jars is 62.8 cm. Therefore, the correct option is D.
