The circumference of a hula hoop is 86 cm what is the radius of the hula hoop?

Formula for circumference that involves the radius ⇒ C = 2πr

Since we are given that the circumference is 86 cm, substitute it in.

86 = 2πr

Now, π is equal to approximately 3.14 so we can

plug 3.14 in for π and we have 86 cm = 2 (3.14) r.

Now solve the equation.

2 (3.14) is 6.28 and we have 86 cm = 6.28r.

Now divide both sides by 6.28 and we have 13.6942 = r.

So the radius of the hula hoop is 13.6942 cm.