Question

Using x as the variable, write a formula to find the perimeter of the figure. Use the formula to find the perimeter. a regular dodecagon (12-gon); one side is 9.25 cm


a.

645-10-03-00-00_files/i0210000.jpg; 1.29 cm

c.

12x; 111 cm


b.

12 - x; 2.75

d.

12 + x; 21.25 cm

Answer 1

Because you know the shape is regular, you know that all the sides will be equal in length. Since you know that one side is 9.25cm, you can use the formula P=9.25x if you want to use the given side length assuming you do not know the number of sides, or for other shapes with the same side lengths.

Answer 2

c. 12x: 111cm