Question

Bianca filled 2 same-sized jars with flavored popcorn as a gift. She wants to glue a piece of ribbon around the edge of each lid.

The radius of each jar lid is 5 centimeters. Approximately what is the total length of ribbon she will need for the two jar lids? (Use 3.14 for .)
A.
157 cm
B.
31.4 cm
C.
78.5 cm
D.
62.8 cm

Answer 1

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

`C=2\pi r`

Where, r is the radius of the circle.

Putting π=3.14 and r=5, we get

`C=2\pi r`

`C=2(3.14)(5)`

`C=31.4`

The ribbon required for one jar is 31.4 cm. So, the ribbon required for two jars is:

`\text{Ribbon required}=2* C`

`\text{Ribbon required}=2* 31.4`

`\text{Ribbon required}=62.8`

The ribbon required for two jars is 62.8 cm. Therefore, the correct option is D.