Which equation can be used to find the perimeter of a regular decagon with sides of length 5 m?

p = 10 + 5

p = 10 5

p = 2(5) + 2(10)

p = 10(5)

Find the value of the cosine for angle a

Which of the following are accepted without proof in a logical system? check all that apply.

The formula for finding volume of a cone 1/3pi x r^2h. the volume of a cone is 300 cm^3 and the height of the cone is 10 what is the approximate radius of the cone