Question

Jada is making circular birthday invitations for her friends the diameter of the circle is 12 cm she bought 180 cm of ribbon to glue around the edge of each invitation how many invitation can she make

Answer 1

4 invitations

Explanation:

The diameter of the circles is:

`d=12cm`

and she wants to put a ribbon around the edge of each, so we need to know how much the circumference of the circles measures (the perimeter):

`c=d*\pi`

replacing the diameter value:

`c=12\pi`

And since she have 180 cm of ribbon, she can only make:

`(180)/(12\pi) =(180)/(12*3.1416) =(180)/(37.7) =4.77`

She can make 4.77 invitations, which means she can only make 4 complete invitations.